This classic riddle says: A man shaves every day, but his beard never gets shorter. How is that possible? The wording makes it sound as though he is shaving his own face, which is the trap.
The answer is: he is a barber.
The man shaves other people every day as part of his job, so his own beard does not have to get any shorter at all. Nothing in the riddle actually says that he is shaving himself.
This is a simple example of how riddles rely on assumptions. Most people hear the words “a man shaves every day” and automatically picture him standing in front of a mirror. Once you remove that assumption and think about someone whose profession involves shaving others, the answer becomes obvious.
