Dead Man
Riddle: There lived a man in a house and everytime he went to bed he turned on the light. One night, the man forgot to turn on the light. The next day he read the paper and killed himself.
Why?
Answer: The man lived in a lighthouse. He forgot to turn on the light and a ship crashed. The next morning he read in the paper that the ship crashed and killed himself because he felt guilty.
Source: https://www.riddles.com/1331
