A man walks into a bar with a large box. He sits down at the bar and orders a drink. The bartender sees the box and asks the man what's inside.
The man replies, "I'll show you, but you have to promise not to laugh."
The bartender agrees and the man opens the box to reveal a tiny piano and a little man sitting in front of it. The little man starts playing the piano beautifully, filling the bar with sweet music.
The bartender is amazed and asks the man where he found such a talented musician.
The man explains that he found a genie who granted him one wish. He wished for a tiny piano player who could play any song on command.
The bartender is impressed and asks the man if the genie is still around. The man says yes, he's still in the box and the bartender asks if he can make a wish.
The man agrees, but warns the bartender to be very specific with his wish. The bartender thinks for a moment and then says, "I wish for a million bucks."
The man opens the box and out flies a million ducks, filling the bar with quacking and chaos. The bartender is furious and demands to know why the man didn't deliver what he wished for.
The man shrugs and says, "Do you really think I wished for a 12-inch pianist?"