Imagine this.
Dean and Cas adopt small child.
Small child and Cas disappear one day, and come back with a cat.
Dean: Get rid of it.
Cas: But-
Dean: NOW.
Small child: Nope! He's family now!
Dean: Cas, get rid of the cat.
Cas: But we like him!
Dean: I swear-
Small Child: His name is Bon Jovi Metallicat.
Dean:...........
Dean: I'm still gonna shoot your fucking cat.
Cas: Dean!
Sam: Dollar in the swear jar- now.
Dean: Oh for crying out loud.
Cat: Meow!