Most of the Quidditch games we see in the Harry Potter movies end with someone catching the Snitch (and winning).  How often do Quidditch games end without the Snitch being caught?  (I don't expect an exact percentage - but does the Snitch matter as often as it seems from the movies? or is it less frequent?)
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The game can only end when the Snitch has been caught, or by mutual agreement of the two teams' Captains; the latter is very rare, however, as one team would have to lose. (source: HP Wikia on Golden Snitch)   Is there an example from canon of this resolution to the game ever happening?
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In the Harry Potter universe, young wizards and witches are sometimes born to Muggle parents. In this case, someone from the wizarding world visits them to offer the child their place at Hogwarts.   Anyway, attendance at Hogwarts isn't mandatory because parents can home school their children, but is this true for all children, or only those whose parents can teach them magic?  Would a Muggle-born wizard or witch be left to their own devices, not taught magic or integrated in the wizarding community, basically be left to live as a Muggle?   The only example I know of is Harry (the Dursleys didn't want him to go, but they were intimidated into letting him) but then again he is Harry Potter and there is no other way (even for Dumbledore in-universe) than to make an exception for him.   Do we know what the general rule would be for muggle born wizards and witches, or do we have any clues?
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I've been informed by those who know much more about Harry Potter than I that Hogwarts is protected with a Disillusionment Charm so all muggles will see is ruins with a "Danger: Keep out!" sign around them.  (Apparently this was in one of the first three books, but I'm not sure where it was.)  My first thought was, "Well, a danger sign would encourage some muggles to investigate!"  Which leads to what I think is an obvious question: Will a disillusionment charm on a place like that still work when a person is real close to the location?  Will it work from inside the location?  For example, if a curious muggle made it to the gates of Hogwarts and started walking around inside, would they still see it as abandon and in ruins, or once they entered, would they see it as it is?
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I have been re-reading the Harry Potter books again and I noticed that Harry, Ron and Hermione have been giving each other Christmas presents each year at Hogwarts. How have they been able to buy each other presents if they are not allowed to go out of Hogwarts?   From their third year on they could visit the village and buy presents there, but what about the first two years? Did they give their personal belongings? Or did they just happen to have boxes of chocolates or books to give each other?
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By now, most of us are familiar with the quote by Ron Weasley in Sorcerer's Stone:     There hasn't been a witch or wizard gone bad who wasn't in Slytherin.    Logic states that this means that all dark wizards/witches were from the Slytherin house, but not that all Slytherin were dark wizards/witches.  But how much of this was just hyperbole from an 11 year old boy?  After all,  was arguably a "dark wizard" and studied at the Durmstrang Institute. Peter Pettigrew (who actually was a Death Eater) and Sirius Black (who was falsely accused as one) were also both from Gryffindor.  As noted in  and from Goblet of Fire, we know that the wizarding community is not confined to England or even Europe. We know that there are other schools. I haven't been able to positively confirm this, but it appears - and it would make sense that the other schools have their own "houses" similar to Hogwarts. Following that line of thought, it isn't a stretch to assume that other houses look for similar traits/qualities such as "potential greatness".  Seeing as that what Voldemort  would affect all wizards/witches, it would make sense if wizards/witches from other countries joined up with him.  Is there any evidence that the Death Eaters was or was not an international group?
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Do we know how long potions (in general, or at least specific ones) are potent (no pun intended) in Harry Potter canon?  E.g. do they last a couple of hours? Minutes? Years?   I seem to vaguely remember some comments of Snape's about Wolfesbane potion therfore I think at least some information exists.
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When you discard cards at the beginning of the game, where do they go? The appearance is that they get shuffled back into the deck. However, after discarding key cards and not receiving them the whole game, I am now wondering if they get put in the bottom of the deck. Where do they go after being discarded?
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Inheriting the magical blood down the line, via a wizard father or a witch mother is understandable in case of Half-Bloods.  I am wondering as to how Muggle-borns end up with magical ability?
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My party went up against two wizards. Wizard NPC 1 cast a spell, and Wizard PC used their reaction to Counterspell to try to block it. Wizard NPC 2 counterspelled Wizard PC. I have two questions about this:   Is there any defence against this? If it was just one NPC Wizard, could they use their reaction, during their turn, to counterspell the PC Wizard's counterspell?
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We know that someone actually died while playing Quidditch. So why didn't anyone, such as Voldemort or Draco, just poke a quill in Harry's eye to kill him?
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We know that Voldemort knew that Grindelwald was not killed by Dumbledore, as he himself killed Grindelwald.   We also know that Voldemort knew that Dumbledore was the last person to wield the Elder Wand with its full allegiance because he killed Snape in an attempt to inherit that allegiance from him, who he assumed inherited it from Dumbledore.   Now Voldemort is no idiot.   Following this chain of logic, based off of what he knew, he must have realized that Dumbledore didn't gain the wand's allegiance through murder as he never killed Grindelwald, so why did he feel the need to kill Snape in order to win the wands allegiance for himself?   Surely he must have known that disarming him would have been enough. Was he so blinded by his desire for the wand that he was willing to try anything? Or was he so pressed for time that he didn't fully consider the matter?   I can't imagine the latter to be true as Voldemort himself said to Snape before killing him that he considered the matter for a long time, but that, of course, could be a lie.   Or perhaps he decided that what with Snape no longer being a competent spy after being outed that he had outlived his purpose and would be more valuable dead as a result of this last ditch effort to gain the wands true power.  I'm just answering my own question at this point, but I'd like to put it to you all. Is there something I am missing here? Is there any word from JKR that can clear up this seeming lapse in Voldemorts judgement?
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My question is straightforward. Does the Sorting Hat speak only to the person wearing it, or to the Great Hall? Did all of the students hear it say,      "Not Slytherin, eh?"   when Harry used it?
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In HP and the Chamber of Secrets, Harry, Ron, and Hermione  by brewing Polyjuice Potion and drugging and impersonating other students, just in order to get into the Slytherin common room and probe Malfoy for information about the Chamber of Secrets.  Is this little adventure ever discovered by Those in Charge (teachers)? Or even by Malfoy?  If so, did they ever get punished? I can't see how they could fairly have avoided it (other than they're the Golden Trio and always do). In the end they don't actually get any useful information, except that Malfoy isn't the culprit. This escapade doesn't help them at all in their eventual discovery of the culprit and destruction of the Basilisk. It was just motivated by their suspicion of Malfoy, which was essentially based on "he's Slytherin and we don't like him" and turned out to be unfounded.  If not, how could it remain undetected? Hermione's skill with Polyjuice Potion is eventually common knowledge ... more importantly, why didn't Crabbe and Goyle run to tell someone when they woke up and found they'd been drugged? Did the topic never come up between Malfoy and the pair of them, with Malfoy realising he'd been talking to impostors? What did they tell Madam Pomfrey about Hermione's semifelinity after her failed attempt to Polyjuice herself into Millicent Bulstrode?
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I was wondering how come Harry was able to do Lumos without touching his wand in OotP. I remember that he tried to do magic without his wand before (or afterwards), and he couldn't.  Sorry if this is a repeat question. I couldn't find the answer anywhere.
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As part of my digging into heritability of magic, I am trying to see if there's any difference between the chances of being a wizard with one Muggle parent if your mother vs. your father was a Muggle.  As far as I know, JKR didn't cover that explicitly, but we can at least make a guess based on statistics.  As such: Of all the half-Muggles mentioned by JKR (books, supplemental books, interviews, Pottermore) where we know who was a Muggle among parents, how many were Muggle fathers vs Muggle mothers?  To avoid creating an endless list of answers, if you can think of another example that wasn't tallied before, please edit it into an existing answer.  NOTE: this question uses "half-Muggles" instead of JKR's term "half-blood" because I only care about kids whose one parent was a Muggle; whereas in Potterverse, the "half-blood" term also applies to those whose second parent was Muggle-born magic user (such as Harry Potter).
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Throughout the Harry Potter series, Professor Trelawney makes many different prophecies and predictions. Although most of them are implied to be nonsense, often enough they still get fulfilled. Which ones have come true? Which ones have been proven false? Which ones are still possible?  How many of Trelawney's prophecies have come true?  I'm not asking if Divination in Harry Potter is real, or what it is. I am asking for a finite list of which of Trelawney's prophecies came true, and which ones didn't.
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Harry is a half-blood and Ginny is a pure-blood, so what does that make his children? I've been told it means they are pure-bloods but I can't be sure. What do you think?