Why do people nod their heads for "yes" and shake for "no" ?
90196
It is a cultural mannerism.  People from India shake their heads to show approval and acceptance of an idea.
807390
I've wondered the same thing. People are a strange species. I guess they want to be polite by offering you, but they hope you'll say no (and people usually say no under certain circumstances) and get kind of shocked that you did the unexpected (you can see them go "damn!" in their mind, don't you?).
345712
It is herd behavior, it signals when the herd needs to move on to something else. When one person yawns, it is passed along to 'pass the message.'
334673
i think it has something to do with a "flight or fight" syndrome. like when you get startled. except when you are nervous, you know there is no need to run and you really have no need to fight, so therefore, you laugh. some people stutter or get flustered, you laugh. nothing wrong with it, just maybe say excuse me, im a little nervous. if you are feeling pressure, explain that the person is making you uncomfortable and could they please back off.
432468
Manners are getting the answer "Yes" from someone who will potentially deny or say "No" to your requests.\n\nA view askew isn't necessarily a bad thing. Although it helps being polite, since so many others have been conditioned to respond to politness and manners. It is basically just putting a fancy wrapping paper on what might be just a practical gift.\n\nEmbrace your warped ideas. Politeness and manners to me is sometimes a sign of over-conditioning, and a sort of warped idea in itself.\n\nBut if you must learn some manners, I have linked a site below that MIGHT help.
453919
Some people want to ask you "your opinion" on many things in life.  Then when you offer it, they want to argue with you about your opinion.  What they really wanted wasn't your opinion, but rather for you to agree with them on their opinion.\n\nI have told a person more than once who wanted to argue with me about an opinion, "Hey, you asked me my opinion and I gave it to you.  I'm comfortable with you not agreeing with me.  Why can't you be comfortable with me not agreeing with you?"
410450
Some people with OCD or impulse control disorders do it.  Its a compulsive behavior.  Kind of like trichotillomania.
60953
I live in the US where we have become very slopy when it comes to things like this. \nYes, you should stand up. Not only is it rude, it is akward to shake someone's hand while one person is sitting. \nI can see no reason why you would not do this other than sheer laziness.
700888
people yell because they're trying to get their point across while their angry  and they believe that their point is the only correct one. By yelling they think they can change the other person's mind which really never works.
4104
Its because we're dumb, and we're dumb because we don't understand crazy people. ^.^  Mostly, its better to not try and understand them.  Like why they say no when they really mean yes, or why they ask stupid questions that they don't want answered in the first place.  Just go with the flow!
368117
1. Thank them for asking!! (This shows appreciation that they care enough to ask, and keeps them from nagging)\n2. Give firm tone to your voice so they know you mean what you say.\n3. Tell them why you are saying NO (A reason decreases their chances of arguing the point)\n4. Consider the matter resolved, and change the subject. This keeps them from manipulating you with reasons to say yes.\n5. MOST IMPORTANT: Make sure you want to say no. If you really want to say yes, any "NO" will come off as dumb in your own mind.
352094
I look at all of them and acknowledge with a smile,wave,or head nod mostly.Sometimes i use verbal greetings and handshakes as well. I make eye contact mostly.I observe at whatever distance my personal space boundaries are activated.During this timeframe i use my other senses to check around me.Some people do look as they pass and others don't.
800838
=some people can be so inconsiderate toward others.  Most deaf people or those hard of hearing like the elderly have learned to lip read.  If someone will not face you when talking with them, thenn you are just wasting your breath and they are not worth talking to.  although most deaf people "sign" they realize that the masses of us do not how how and respect that.  We should be just as respectful toward them and face them while speaking.
664075
Researchers aren't really sure. They seem to have pinpointed the initiation to a particular part of the brain, and speculate that it's a synchronized social reflex that may serve an evolutionary goal of greater tribal cohesiveness and mutual protection. See the referenced web page. I've noticed that it's not just other people yawning, but even reading the word 'yawn' that does it for me, even if I'm well oxygenated and wide awake!
19613
Shaking hands originated as a way to show that you didn't have a weapon in your hand when you greeted a person. I believe it was during the Roman days of Ceasars.
609665
Because they trigger the receptors in the brain to relax.  Yawning signals relaxation to other humans, thus causing themselves to inadvertantly yawn.  It's like human relation reflex.
1137465
It's a psychological expression of their impatience.  Or just hoping the door closes faster so no one else enters the lift and holds them up anymore.