This is quite an awesome PR "problem" to have:
We are investigating. Some people are getting a lot more excited than we’d expected. We need to better communicate to people how to deal with Wii as a new form of entertainment.Caution to parents - the Wii can be too much fun, and your kids may get a surprising amount of exercise! The YouTube video at the end is awesome.
If you are having so much fun that you start perspiring, take a moment to dry your hands.