A guy gets into a taxi after a boozy night out and halfway through the journey wants to stop and buy cigarettes. He taps the driver on the shoulder and suddenly the driver screams, swerves across the road and mounts the sidewalk stopping just short of a brick wall.
All was quiet for a few moments and then the driver turns around and says "Don't EVER tap me on the shoulder whilst I'm driving EVER again". The guy says, "I'm sorry, I didn't know it would scare you so much"
The driver replies, "It wouldn't normally but this is my first night as a taxi driver and up until yesterday, for twenty five years, I was driving a Hearse.