Three drunks hailed a taxi. The driver - seeing that they were wasted - decided to pull a fast one. So he switched the engine on, then quickly switched it off and announced, "We're here!" The first guy handed him the fare, and said, "Thanks." But the third guy just angrily smacked the cabbie's head. "What was that for?" asked the cabbie, afraid that he'd been caught. "That," said the passenger, "is for driving too fast!"