When I was in junior high school my mother played a good trick on my father. She was always an early riser (as in 5:00 a.m.).
My father had to get up at 7:00 for work.
She went around the house and set all the clocks to 9:25 or so, then ran frantically into his room, and woke him up yelling "John! John! You overslept!"
He was just about out the door before she broke down and let him in on the joke.
