the top comment is a long list of pun replies, its amazing. [ame=http://www.youtube.com/watch?v=Z9ndTz5Q-dg]88 fingers Edward - YouTube[/ame]
My cat, well one of them anyways, does the same thing, almost. There's a spot on his back that is sensitive - you touch/pet it and it activates his self-itching mode...usually, he will just scratch himself, his front paws etc, but it gets activates no matter what is in range - eg, a hand.
If you seen "Batman The Dark Night", You'll get a good laugh out of this! Batman Can't Stop Thinking About Sex - YouTube