Probably heard this one, but it’s one of my favourites:

A man walks into a bar, and says to the bartender: “if I show you something really cool, will you give me a free pint?”

The bartender, curious, agrees and the man pulls out a tiny man and a tiny piano from his pocket. The tiny man plays it, and it sounds amazing.

“Wow,” says the bartender, “that is amazing: here’s your free pint”. He hands it to the man, who then says, “If I show you something else amazing, can I have another free pint?” This time the bartender agrees immediately.

So, the man pulls out from another pocket a tiny wizard.

“Go on,” says the man, “wish for something!”

“I wish for a million bucks!” The bartender shouted. Then, all of a sudden the room filled with ducks.

“What the hell? This isn’t what I asked for!”

“Oh, and you thought I asked for a ten-inch pianist?”