The testicle torsion I'd heard of before, a couple of times actually.
But I think this one crowns the 2008 injury list:
Houston Astros second baseman Kazuo Matsui will undergo surgery to repair an anal fissure on Monday in Houston.http://sports.espn.go.com/mlb/spring200 ... id=3294343
No word on how Kaz GOT the fissure. Look it up in Wikipedia for a real treat on the potentials.
Okay, now I feel a little strange for being the one to point it out even.