Man gets into a taxi, tells the driver his destination and sits back to relax. A while through the journey he taps the driver on the shoulder to ask him a question.
The driver screams, loses control of a car which mounts the pavement takes out a bus shelter and finally shudders to a stop barely missing a huge plant glass window.
The passenger, still in a state of shock apologises and says he didn't realise tapping the driver on the shoulder would have such a reaction.
The taxi driver turns round and says' It's not your fault, it was mine. This is my first day as a taxi driver, I drove a hearse for the past 25 years!'