A man goes into a room and sits down.

Suddenly his weight increases, then eventually resumes back to normal.

After several hours - suddenly his weight decreases, then eventually resumes back to normal.

Finally when the man exits the room, his weight is the same as when he went in.

What happened?

EDIT: The answer is not "He went in an elevator".

What transpired was not an abnormal event.

  • $\begingroup$ @SteveV not the same answer, but yes I see that it is fairly similar. $\endgroup$ – obl Oct 16 '18 at 18:56
  • $\begingroup$ if it is not the same answer, I withdraw my objection, then! $\endgroup$ – SteveV Oct 16 '18 at 18:57
  • $\begingroup$ phew :) I will try to add some edits to clarify how it cannot be an elevator. $\endgroup$ – obl Oct 16 '18 at 19:00
  • $\begingroup$ He went in the loo with some food. Some food goes in, some byproduct goes out and the weight goes up and down. $\endgroup$ – rhsquared Oct 16 '18 at 20:30


he got on an airplane! And perhaps it was one of those astronaut training flights where you are weightless for a brief period of time

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  • $\begingroup$ That's it! Although the decreasing weight part was supposed to reference the descent of the plane :P $\endgroup$ – obl Oct 16 '18 at 19:26

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