Knock on the door.
Close the door! I'm dressing!
A: When the door is open.
A wind tunnel.
Four blondes waiting at a four way stop.
Because Freedom Rings.
Knock on the hatch.
A: You're a real drip.
Swim down and knock on the hatch. (In Sweden we have a running tradition of telling jokes about stupid norwegians. They do the same about swedes)
A submarine!
No, How Long is a Chinaman.