A Musical Monkey
A Guy goes into a bar with his pet monkey and says, "I bet $50 that no one here has a musical instrument that this monkey can't play—and play well."
The people in the bar look around and someone fetches an old guitar. The monkey has a look, picks it up, tunes up the strings and starts playing a complicated classical piece. The monkey' owner pockets the fifty bucks.
The next guy comes up with a trumpet. The monkey takes the horn, loosens up the keys, licks its lips and starts playing a moving jazz solo. The guy hands over another fifty bucks to the monkey's owner.
The bartender has been watching all this and disappears out back, coming back a few moments later with a set of bagpipes under his arm. He puts them on the bar and says to the guy, "Now if your monkey can play that well I'll give you a hundred dollars."
The two men both place theirs bets on the bar. The monkey takes a look at the bagpipes, takes them in his arms and begins to play.
The bartender immediately reaches for the two hundred dollars, but the monkey's owner stops him. "Hey! What are you doing? He plays the bagpipes very well!"
"Oh yeah?" responds the bartender as he puts the money in his pocket. "Prove it!"