A Guy walks into his local bar and sees a tiny little man, no more than a foot tall, playing a tiny piano on top of the bar. He asks the bartender where on earth did he find something like that?
The bartender told him that in the bathroom behind the toilet there's a magic lamp. If you make a wish and rub the lamp, a genie will grant your wish. So the guy goes into the bathroom and sure enough, there's a strange lamp behind the toilet.
He makes a wish and rubs it, then all of a sudden he hears what sounds like a tornado. He opens the bathroom door to see a million ducks rushing into the bar. "Oh no!" he exclaims, "I didn't want a million "ducks"!"
"Tell me about it," says the bartender, "I didn't want a 12-inch pianist, either."