A passenger in a taxi leaned over to ask the driver a question and
tapped him on the shoulder. The driver screamed, lost control of the
cab, nearly hit a bus, drove up over the curb, and stopped just inches
from a large plate glass window.

For a few moments everything was silent in the cab, and then the still
shaking driver said, "I'm sorry, but you scared the daylights out of
me."

The frightened passenger apologized to the driver and said he didn't
realize a mere tap on the shoulder could frighten him so much.

The driver replied, "No, no, I'm sorry, it's entirely my fault. Today is
my first day driving a cab. I've been driving a hearse for the last 25
years."