Cas: Your music is too loud.

Jack, wearing earbuds: What?

Cas: I said your music is too loud!

Jack, still wearing them: What!?

Cas: Dean, tell Jack his music is too loud.

Dean, wearing another pair of earbuds, blasting Crazy Train at full volume, and lip syncing into his beer bottle:

Cas, sighing: I am the only reason you two are still alive.