Mostly because it always gets me in trouble. You see, I'm a nerd. Have been all my life. Even when I played sports (and I wasn't half bad either) I was still a nerd because I was one of those kids who could be athletic and still carry A's. Problem with that is, the rest of the athletes were threatened by that so didn't like me. The rest of the brainiacs were threatened by the playing of sports and didn't really care for me either.
Luckily there came an epiphany. A light shone down on me (actually it was from the concussion I got in practice) and I realized it was better to be able bodied and smart than brain damaged and beat up all the time.
OK, I've rambled about that long enough. It was meant to give you all some insight as to why I find the attached funny. Math jokes crack me up.
I do have to give credit for this to the forums of my guild in Everquest. It shows up alot in there.