Dennis had a problem with getting up late in the morning and as a result, he was always late for work. His boss was getting very angry with him, and threatened to fire him if he didn't do something about the problem. So Dennis went to his doctor, who gave him a pill and told him to take it at night to help him sleep.
Dennis slept very well, and actually got up before his alarm went off. After enjoying a leisurely breakfast, he cheerfully drove to work, where his boss greeted him at the door.
"Boss, the pill the doctor gave me actually worked!"
"How nice for you," his boss glared, "but where were you yesterday?"
