What can go up the chimney down, but can't... What can go up the chimney down, but can't... - The Funniest Joke What can go up the chimney down, but can't.... What are the best jokes you know that make others laugh in less that 20 seconds? What can go up the chimney down, but can't...

What can go up the chimney down, but can't go down the chimney up?

An umbrella.