I posted this almost six years ago, but I felt the need to re-post it because it's just too funny. I have no idea where I found it before, so I'm just re-posting what I posted before. The explanation: The whole joke is that American football players are usually perceived as being dumb jocks, and they're playing football because they can't do anything else worthwhile. Well, imagine that there's a university solely for football players and no one else — and this is the entrance exam they'd have to take to qualify for the school.