Castiel: Dean, I have learned a humorous joke.
Dean: Oh this should be good. Go ahead, Cas.
Castiel: Knock. Knock.
Dean: Who's there?
Castiel: Interrupting moose.
Dean: Interrupting moo-?
Sam: Hi guys! So get this...
Haha, that's hilarious!
And Cas... did you get that from Crowley? Totally sounds like a Crowley thing to come up with, especially with the whole "moose" thing.
