There was this cable car filled with tourists that was taking them to the top of the Swiss mountains. In an effort to keep them calm, the Swiss conductor said: "This is the safest transportation you will ever use. Our cable is thicker than a man's arm. It can take the weight of ten cars. Should it accidentally break (which is highly unlikely) there is another cable underneath it that is even thicker. It is made of the strongest steel and can hold any weight put on it."
Tourist A: "What happens if the electric power goes out?"
Conductor: "Impossible!! There are three power sources. Each one can take over for the others, should there be a need. Of course there will be no need."
Tourist B: "It can happen, and then we'd slide down this cable and smash into the mountain at a hundred miles an hour."
Conductor: "Ah, not so sir. Do you see this thick piece of metal behind the car? That is the braking mechanism. Should the electricity fail, almost an impossibility, the brakes will go on automatically and hold the car in position."
Tourist A: "Brakes have been known to fail."
Conductor: "Not these sir. But, for argument's sake, let's say they do fail. Under this car is a second brake. It locks the car in position immediately, if the first brake fails."
Tourist B: "What if they both fail?"
Conductor: "Over this car there is a giant set of tungsten steel claws that will shut tight and trip the car, holding it steady until the passengers are rescued."
Tourist A: "And if the claws don't grip, you can kiss the conductor's bootie!"
Tourist B: "I was ready to kiss it after the second brake failed!"
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huh?