Bungee Jumping in Mexico
Al and Joe are bungee-jumping one day. Al says to Joe, "you know, we could make a lot of money running our own bungee jumping service in Mexico." Joe thinks this is a great idea, so they pool their money and buy everything they'll need; a tower, an elastic cord, insurance, etc. They travel to Mexico and begin to set up on the square.
As they are constructing the tower a crowd begins to assemble. Slowly, more and more people gather to watch them work. When they had finished, there was such a crowd they thought it would be a good idea to give a demonstration. So Al jumps.
He bounces at the end of the cord, but when he comes back up, Joe notices that he has a few cuts and scratches. Unfortunately, Joe isn't able to catch him, and he falls again, bounces again and comes back up again. This time he is bruised and bleeding. Again Joe misses him. Al falls again and bounces back up. This time he comes back pretty messed up. He's got a couple of broken bones and is almost unconscious.
Luckily Joe catches him this time and says, "What happened? Was the cord too long?"
Barely able to speak, Al gasps, "No, the bungee cord was fine. It was the crowd . . . WHAT THE HECK IS A PIÑATA?"