It's not often we're graced with controllers with potential for injury above and beyond a thumb callus. Every once in a while we hear about Guitar Hero destroying someone's knee, but an actual mainstream, comes-with-the-console device that will leave thousands maimed or dead? We haven't seen such carnage since the R.O.B. rebellion of '86.
The Wii comes with about seventeen pages of warnings about using the Wiimote without the wrist strap.