A man walks into a bar carrying a box, and says to the barman, "If I show you something really amazing, something you've never seen before, can I have a free pint of beer?"
The barman thinks for a moment, and agrees. "But it'll have to be really amazing."
So the man puts the box down on the bar and opens it, and inside there's a small scale grand piano, and a little man wearing a suit. The man sits down at the tiny little grand piano, and starts playing a selection of well-known classical tunes.
By then the barman's already pulling the pint. "A deal's a deal," he says. "But where did you get him?"
"Well," explains the man, packing away the box, "I met my fairy godmother yesterday, and she said I could have one wish."
"And you wished for that?"
"Well, you know, I think she must be a little deaf, because I'm pretty sure I didn't ask for a twelve inch pianist..."