Joke: Engineers like to solve problems

I like to tell this to students to illustrate that engineers like to solve problems. A lively discussion about consequences to solving those problems usually follows:
 
A priest, a lawyer and an engineer were about to be executed during the French Revolution. The priest was brought up and laid down. The rope was released but the blad of the guillotine did not fall. He declared it was divine intervention and was released. The lawyer was brought up next. He was laid down, and again, the rope was released. He declared he could not be tried twice for the same crime and was released. The engineer was next, and as he was being laid down, he looked up at the blade and said, "Oh, I think I see your problem."