A taxi passenger taps the driver on the shoulder to ask him a question. The driver screams, loses control of the car, nearly hits a bus, goes up on the footpath, and stops centimeters from a shop window. For a second, everything goes quiet in the cab, then the driver says, "Look mate, don't ever do that again. You scared the daylights out of me!"
The passenger apologizes and says, "I didn't realize that a little tap would scare you so much.”
The driver replies, "Sorry, it's not really your fault. Today is my first day as a cab driver. I've been driving a hearse for the last 25 years."