humor

Physical comedy - falling, stumbling, accident
A joke typically has a setup, and then a subversion of the expectation.
Irony, which is a flipped expectation.
Used by clowns and typically associated with the circus and theater.
Jesting is a form of humor centered on mockery, foolishness (the "fool"), and frivolity
Laughter is "good medicine" and is a form of entertainment, distraction, rest and renewal.
Trickery can be humorous.