"A healthy 29-year-old medical resident awoke one Sunday morning with intense pain in the right shoulder. He did not recall any recent injuries or trauma and had not participated in any sports or physical exercise recently. He consulted a rheumatology colleague. The Patte's test was positive, consistent with acute tendonitis isolated to the right infraspinatus.
After further review of his activities during the previous 24 hours, the patient recalled that he had bought a new Nintendo Wii (pronounced 'wee') video-game system and had spent several hours playing the tennis video game. [...cut for a description of how you play the Wii...] The final diagnosis for the isolated right shoulder pain was Nintendinitis."
Because if a medical resident can't diagnose his own symptoms after playing a strenuous sports game, after playing it for several hours, you're seriously going to want him to look after your body, right?