bash.org is a site that collects quotes off IRC. It can get technical, but mostly it's understandable by most. It covers a lot more things than just plain jokes. Since the average age group who converse through IRC seem to be small, this reflects in the poor use of language. Anyway, it's sheer fun. Here's one of my favourites:

Hey, you know what sucks? vaccuums Hey, you know what sucks in a metaphorical sense? black holes Hey, you know what just isn't cool? lava?