You're an archangel, like Castiel. But Castiel is busy right now so he left Dean and Sam to take care of you. Like Castiel, your social skills are rusty and it leaves you oblivious to many things. Currently, you're all sitting in the library of the bunker: you decide to break the silence by doing something Castiel taught you.

"Samuel. Dean. Would you like to hear a piece of mathematical humour that Castiel has taught me?" You ask with a monotone almost expressionless voice. Sam and Dean glance at each other for a moment. Sharing a silent conversation. If Cas taught it. They've likely heard it and it's likely to be unfunny. Dean sighs.

"A- a joke?.. sure... go ahead, Angel.."

"Why was the number 6 afraid of 7?" You start to tell the joke. Dean gives Sam a side glance. They already know how this joke ends.

"Because as I have come to understand it, 7 is a prime number and prime numbers can be quite intimidating." You look between the two brothers expectantly. Sam cracks a small, forced smile, you don't pick up on the fact that it was not funny.

"Perhaps both of you would much more appreciate a physics joke" You pause as you think of the joke. "Why don't photons carry suit cases?" You pause again, this time for effect. "Because they travel light."