"Musical Octopus" joke

A guy walks into a bar carrying a very talented octopus. He says as much to the patrons of the bar, and bets $500 that the octopus can play any musical instrument that the guys can produce.

One guy accepts. He lays $500 on the bar, says, "Here's $500 that he can't play my trumpet." So he goes home and gets his trumpet. The octopus looks at it, scratches its head, turns it over, then starts to play, the most beautiful sound anyone has ever heard from a trumpet. The owner pockets his new $500.

Another guy says "Here's $500 that he can't play my clarinet." So he produces the instrument, and the octopus looks at it, turns it over, then starts to play, the most beautiful sound anyone has ever heard from a clarinet. The owner pockets his $500.

Another guy says, "Here's $500 that he can't play my bagpipes." So he get his pipes, and the octopus looks at them, puzzled, then looks at them some more. He does so for about 5 minutes, then throws the instrument across the room and starts cussing. The challenger takes his $500 and his pipes and leaves.

The owner of the octopus is furious. He says to the creature, "What the hell was that? You just cost me $500, you know."

The octopus shrugs and says, "Well I was gonna fuck it, but I couldn't get its pajamas off."