A guy goes into a bar with his pet octopus and says "I bet $50 that no one here has a musical instrument that this octopus can’t play." The people in the bar look around and someone fetches out an old guitar. The octopus has a look, picks it up, tunes up the strings and starts playing the guitar. The octopus’ owner pockets the fifty bucks.
The next guy comes up with a trumpet and octopus takes the horn, loosens up the keys, licks its lips and starts playing a jazz solo. The guy hands over another fifty bucks to the octopus’s owner.
The bar owner 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 and his octopus, "Now, if your octopus can play that I’ll give you a hundred dollars."
The octopus takes a look at the bagpipes, lifts it up, turns it over, has another look from another angle. Puzzled, the octopus’s owner comes up and says "What are you messing around for? Hurry up and play the thing!"
The octopus says "Play it? If I can work out how to get its pajamas off I’m gonna screw it!"