It's an umbrella :P
substitute "up" for "open" and "down" for "closed."
What may go down the chimney up but not down the chimney down?
This sounds like the old riddle "What goes up a chimney down but can't go down a chimney up?" The answer is "an umbrella."
An umbrella
An umbrella could.... but would? doubtful!
Helium
an umbrella
What may go down the chimney up but not down the chimney down?
A chimney.
An umbrella
An umbrella! It can go up a chimney when it's down because it's thin but cant go down a chimney up because its too big!
Smoke
An umbrella.
Smoke
An umbrella
I go in dry come out wet the longer I'm in the stronger I get what am i
I don't get why, but it's an umbrella
An umbrella !