A Little Tense
A taxi passenger tapped the driver on the shoulder to ask him a question.
The driver screamed, lost control of the car, nearly hit a bus, went up on the footpath, and stopped centimeters from a shop window. For a second everything went quiet in the cab, then the driver said "Look mate, don't ever do that again. You scared the daylights out of me!"
The passenger apologized and said he didn't realize that a little tap could scare him so much. The driver replied "Sorry, it's not really your fault. Today is my first day as a cab driver - I've been driving 'hearses' for the last 25 years!!!!!"