So this guy buys a camel at the used camel-lot and heads out into the desert. He gets 10 or 15 miles and the camel starts slowing down, and finally stops and lies down and just lies there, moaning. Guy can't get him up, so he trudges back to town, to the used camel lot, and complains loudly.

The dealer says, "Oh, I think I know the problem," and they get on another camel and go back into the desert. They get to the prostrate camel and the dealer takes one good look, hauls back his foot, and gives the camel a brutal kick in the stomach.

The camel lets fly a fart that goes on for most of a minute, and sounds like epic descriptions of the horn of Roland summoning Charlemagne. Then it jumps to its feet, and prances around, obviously anxious to get going.

The camel dealer says, "Just as I thought. Vapor lock."

Peter.