14. Clarence Blethen
This might be the only injury on the list worth laughing about. Back in the early days of baseball, there was a player by the name of Clarence Blethen, who played mostly in the minor leagues, but got brief call-ups from the Boston Red Sox and Brooklyn Robins. In his only career appearance as a major league baserunner, Blethen slid into second, but forgot that he had previously put his false teeth in his back pocket.
The chompers bit a big chunk out of his rear, forcing Blethen to leave the game due to excessive bleeding. It’s uncertain if a piece of his rump was actually “lost” though, because accounts from the game are scarce; it occurred in 1923, almost 100 years ago!