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