A student told me this joke last week:
"How many emo kids does it take to screw in a light bulb?
Who cares, let them cry in the dark,"
and I laughed, but I'm still not sure what exactly defines "emo," and if you ask, you get answers like this Wikipedia article: i.e. rambling, imprecise, and always mentioning the band Dashboard Confessional and the sub-genre "screamo" . . . but I suppose this is excellent for jokes, because if you can't define "emo," then it is fair game to make fun of it and use it as the butt of a joke because no one will claim to be offended by the term-- but if anyone has a concise definition, please share.