A man goes into a bar...

and says to the barman "will you give me a free drink if i show you something amazing?"

to which the barman says "sure"

so the man opens the door and in walks a guy who is only 13 inches high, who sits down at a piano and plays all of Mozart's work from memory.

The barman is curious and says "how did that happen?" and the man tells him

"there's a genie round the corner, who's giving away one free wish to everyone he meets."

So the barman goes round the corner and says to the genie "I wish for ten million bucks!", and all of a sudden it starts raining ducks from the sky. the barman quickly gets indoors to escape the wave of ducks and says to the customer "that genie you told me about is really deaf."

and the man says "tell me about it. He though I asked for a 13 inch pianist"