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What can go up a chimney down, but cannot go down a chimney up?

Common Wrong Answers

Smoke

Smoke can move up and down a chimney, but it doesn't fit the criteria of going up a chimney when it's down.

A bird

A bird can go up a chimney, but it can also go down a chimney without any restrictions, contradicting the riddle.

A ladder

A ladder is typically used to go up but cannot go down a chimney in any conventional sense, making it an incorrect fit.