Zach Plesac is on the injured list with a non-displaced fracture of his right thumb.
Cleveland manager Terry Francona said yesterday that his pitcher was injured while "probably rather aggressively ripping off his shirt" and catching his thumb on a chair in the locker room. ("Probably"?)
Some other uncommon injuries to baseball players are here and here, including:
Sammy Sosa of the Cubs sprained a ligament in his lower back after sneezing too hard. (2004)
Clint Barmes of the Rockies fell and broke his collarbone while carrying a package of deer meat (from teammate Todd Helton).