random realization

when i laugh, it is more often out of sheer delight with something than because it's actually funny. i.e., just now a song by an old acquaintance popped up on my iTunes, and i laughed because 1) it's not a very good song, and 2) it reminds me of good things. one of my co-workers commented on my frequent explosions of hilarity yesterday, and i had to explain that no, it's not really that anything funny has happened, i just laugh a lot. at, you know, stuff. things that make me happy.

what makes you laugh most often? humor, delight, nostalgia, bloody massacre?