Musical Octopus

A man walks into a bar with his pet octopus. He sits the octopus on a stool and tells everyone in the bar that this is a very talented octopus. He can play any musical instrument in the world. Everyone in the crowd laughs at him, calls him an idiot, etc. So he says that he will wager $50 to anyone who has an instrument that the octopus cannot play.
A guy walks up with a guitar and sets it beside the octopus. The octopus starts playing better than Jimi Hendrix, just ripping it up. So the man pays him $50.
Another guy walks up with a violin. The octopus plays the violin better than Andre Rieu. So the man pays him $50.
Another guy walks up with a trumpet. The octopus plays the trumpet better than Miles Davis. So the man pays him $50.
The barman had been observing what had been happening. He came out and puts a set of bagpipes beside the octopus, who fumbles with them for a minute and sits it down with a confused look.
"What are you messing around for?" the octopus' owner yells "Hurry up and play the damn thing!"
The octopus looks up at him and says, "What do you mean PLAY IT? I'm still working out how to get its pajamas off."