The Detroit Tigers pitcher, Joel Zumaya missed three playoff games from a repetitive strain injury caused by playing way too much Guitar Hero(best game ever). The right-handed pitcher missed the games during the American League Championship Series in October because of forearm pain. Training staff found that his injury was more in line with a guitar playing motion than throwing. Guitar Hero’s main selling-point is the guitar-shaped controller that simulates the strumming and fretboard fingering of a real guitar. When staff told him to stop playing the PlayStation 2 game, the pain went away, and he pitched pain-free for three appearances during the World Series.
The funny thing is, I totally don't blame him for playing the game, it gets VERY addicting.