Humour : The Secret of Laughter

I would posit, that laughter, is more similar to the monkey gene type, as opposed to other gene types. My theory is that, many gene types happenstance on their own, what I mean by this is that we need not evolve from monkeys, in order to have similar genes.

Laughter, is associated with pranking, and is a bit like a dopamine rush or...ahem...orgasm. I would posit that it is primarily a reward mechanism (for accomplishing successful pranking, humor, or absurdity/Ecmandu's "contradictions" theory), but can be retrofitted as a combative defensive mechanism for fear avoidance.

Yes, it seems that laughter is a primate thing. Something to do with the position of the esophagus in relation to the mouth and lungs.
Laughing at other is part of sympathizing with other.
A product of empathy, or the ability to noetically project self - imagination.