A guy walks into a bar with an octopus and says "This is a very talented octopus. He can play any instrument in the world. I'll give five hundred bucks to anybody who has an instrument the octopus can't play.".
A guy walks up with a guitar. The octopus takes it and starts playing like Jimi Hendrix.
Another guy walks up with a trumpet, and the octopus plays it better than Miles Davis.
A third guy walks up with bagpipes. The octopus picks it up, fumbles with it for a minute, then sets it down, with a confused look.
The guy says "Hah! You can't play it.".
The octopus says "Play it? As soon as I get its pajamas off, I'm gonna fuck it.".