To answer this question you need to get some background information about the Wii. Nintendo has developped a new technology by which you have to reproduce real movements (with your controller) that will then be reproduced on the screen by your player or character. For instance, if you play a tennis game and if your player has to make a backhand, you have to make the movement of a backhand with the controller in your hand.
The problem comes from the fact that people don’t use the wrist strap so that your Wii remote can fly very easyly. But sometimes even when people had put their wrist strap they got problems. The reason is clear: they did excessive, too wide motions. To prevent accidents Nintendo has offered safety tips, of which the following is interesting: "Hold the Wii Remote firmly and do not let go. Even while wearing the wrist strap, make sure you don't let go of the Wii Remote during game play and do not use excessive motion. For example, in Wii Sports bowling, the proper way to let go of the ball while bowling is to release the "B" button on the Wii Remote—DO NOT LET GO OF THE Wii REMOTE ITSELF."
Thanks to those problems, the webmasters of ‘Wii have a problem’ have found a great opportunity to create a blog about their passion: damages caused by gaming violence. You can report your own accidents and give pictures of it. Other things to find on the site are funny articles about the Wii.