One day a passenger in a taxi tapped on the driver's shoulder to ask a question, when the taxi driver suddenly screamed, lost control of the taxi, nearly hit a bus and drove onto a pavement where he stopped, only centimeters from a shop window.
"Don't you ever do that again!" screamed the taxi driver in terror, "You scared the living daylights out of me!"
"I'm sorry," said the passenger, "all I did was tap you on the shoulder. How can that be scary?" "I'm sorry," replied the taxi driver, "but today is my first day as a cab driver - I've been driving a hearse for the last 20 years!"