A: “You can’t always get what you want.”
B: “But if you try sometimes, you just might find y-”
A: “You still don’t get what you want.”
Imagine Sam and Cas bonding over documentaries about dogs or bees or whatever. Sam finds cat videos and shows them to Cas who finds them funny. And whenever this happens, whenever Cas laughs because of something Sam did/said, Dean gets jealous because how DARE you get along with my boyfriend I mean my best friend so well I'm the one who's supposed to make him laugh. So he will watch the documentaries with them but always falls asleep which Sam and Cas don't mind bc then they can watch in peace.