Apparently, the Japanese manual for the Wii is ridiculously detailed and ultra-safe: don't choke yourself with the nunchuk cable, don't pour orange soda into your Wii, don't swaddle your Wii in blankets like a baby...
The Wall Street Journal has reported cases of numb arms, sore shoulders, and the dreaded "Wii-elbow," all caused by jerky or repetitive motions from overuse of Nintendo's new Wii console.