These days it's more about what I don't find funny. I prefer British to American humour when it comes to stand up comedians, for the most part. I'm not a fan of "let's just be really random and stupid" stuff like you get with the likes of Dane Cook, who is a terrible comedian as far as I'm concerned. I like puns. I like dark humour, to an extent (read: I like Jimmy Carr's stuff, beyond that level of dark humour it's a case-by-case basis). I like innocent humour, like kids and whatnot. I like happy/silly comedy, like that of Adam Hills or The Emperor's New Groove.