Here's one I heard at work... im assumin its old...but it works....
So this octopus walks into a bar... 2 guys are sittin talkin to the bartender to the octopus pulls up a stool and starts chatting with them. After a few minutes...the octopus begins to brag that he can play any musical instrument in the world flawlessly. Immediately the 3 men start to call bullshit. So the octopus bets them to bring an instrument and put some money on it.
Sure enough...the next night one of the men brings in a guitar and 20 bucks. He bets the octopus, hands him the guitar, and sure enough.... he starts jammin away, playing perfectly.
The next night... the 2nd guy that had been at the bar brings a flute with him. He bets the octopus 30 dollars, gives him the flute, and sure enough.....he loses his money. The octopus plays awesome.
Determined....the next night the bartender brings a set of bagpipes. He gives them to the octopus.... after about 10 minutes of muffled, rambled sounds.... the men begin to wonder why the octopus cant play the bagpipes. The bartender asks, "why cant you play it?" The octopus replies, "Play it? Hell I'm gonna f*ck it if I can get this jacket off of it."