Gil, people with less than 50 posts aren't allowed to give out reps.
I don't get very many reps for being funny... people tell me I have a strange sense of humor, though, so it doesn't surprise me.

Though I have gotten a handful or so of reps this month for being funny. Makes me happy.

I don't really have a trend, though... I tend to get reps from all over the place.
I do find, though, that I tend to get reps from posts that I would consider unextraordinary rather than posts that I think are particularly good. It's nice to be surprised, though.