Bob and Joe are bungee jumping one day. Bob 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 pull 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 in a town. As they are constructing the tower, a crowd begins to assemble.
Slowly, more and more people gather to watch them at work. When they had finished, there was such a crowd they thought it would be a good idea to give a demonstration. So, Bob 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 Bob falls again, bounces and comes back up again. This time, he is bruised and bleeding. Again Joe misses him. Bob 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 finally catches him this time and cries, "What happened? Was the cord too long?"
Barely able to speak, Bob gasps, "No, the bungee cord was fine, it was the crowd. But tell me something! What the hell is a pinata?"