Yes/No

Why do we nod our head for yes and shake for no?

What do you mean "we"?

>>2
Most humans, in general

>>1
speculuation:  "no" gesture is from baby moving mouth from sour tit

yes gesture is from you licking my balls

>>3
Learn about other cultures, assfuck

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>>6
i wouldn't call ethnic cultures human?

I do the opposite to confuse my opponents.

>>9
Who are your opponents, my good sir?

All the ones, legs eleven.

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http://video.google.com/videoplay?docid=-3323021761394989726

Documentary called "The Human Animal"  Desmond Morris examines human body language.  It's pretty cool