Later in the day September 18

I have figured out one part of the puzzle on what makes people laugh. It depends on the laugh. An embarrassed giggle, a belly-laugh, a I've-got-the-giggles-and-i'd-laugh-at-a-orange laugh, a held back laugh.... I have to expand the question to, what makes people laugh certain types of laughs!

Something else also occurred to me. Something else that people laugh at

1.  Bodily functions. (Like farts) Don't ask me why, I've never understood why that was so funny.

2.  Rhymes or limericks.