Well ive been kinda wondering this because it seems that different areas seem to hurt more when you pull hair off them. And before you post please no talking about ripping your "genital hair" out.
I'm going to have to say armpit hair. My friend sneaked up on me with a pair of tweesers and yanked one out ...OWWWWW that hurt.
The tiny hair on the back of your head, but yes to the other too. I have more than one time been brough down head in floor, because someone grapped hold in the little hairs behind my ear. Or my ear itself...