the.com/humor
The brain's funny bone, which is somehow attached to nothing.
means The quality of being amusing, and the ability to perceive or produce it.
from From Latin umor, meaning bodily fluid; ancient medicine blamed your mood on four sloshing liquids, so your sense of humor was once literally a sense of moisture.
Four humorsBlood, phlegm, black bile, yellow bile ruled temperament.
Survival traitLaughter signals safety after a false alarm.
Universal dialectEvery known culture jokes; not all use sarcasm.