Hmm. The absurd, kind of dark and morbid, sarcasm, irony, wordplay, Hank Moody in Californication.
I usually laugh with tears in my eyes, and I laugh a lot. I mean, many things make me laugh doesn't take much, I want people to feel comfortable around me so I'll become more up-beat around them. Ne really makes it the easiest for me I've noticed.
Conceptual humour: irony - especially when pointing it out leaves people completely comfused as to whether the motives for pointing it out are nasty or friendly.
Visual humour: the absurd - especially combined with utter surprise in any participant.