What's the worst sports related injury you've ever had?

[MTK]

I was playing center and I was locked up with a block when someone rolled up the side of my right knee. I sprained the MCL and had bruised cartilage, and it's given me problems ever since. I never missed a game though, just taped the crap out of it.

Now when I walk it cracks like rice crispies and every once in a while it swells up for no reason.