If you've ever browsed through the Wii accessories in a store, you've seen that there are some pretty weird controller add-ons out there. There are tennis rackets, guns, cooking pans, swords, golf clubs, steering wheels... tons of stuff.
Now there's a new one that is almost certainly going to increase the number of TVs broken by people playing the Wii. Check out the Wii Bowling Ball! I'd actually kind of like to have one, but I just know it would be the end of my TV.