Word play, puns, re-writing song lyrics to make them funny (especially "serious" love songs). Depending on mood, can be sarcastic and irreverent, but mostly like to stick to taking things to logical extremes and on to absurdity.
I am careful about who I will joke with, as I slowly realized that some people don't appreciate it and some situations are not appropriate for humor.
Silly me, I thought making each other laugh was the main reason we invented communication.
I've long had a fantasy of being a stand up comic, but I'd never get on stage, and I probably wouldn't be that funny.