Dean was usually the obnoxious one between the two of them. It had been said by family, close friends, and strangers alike that Sam was the pleasant one to be around, while Dean grated on them quickly because of his attitude and his inability to just shut up and stay still. Hell, their own father had said it, even if Sam was the one who'd scream bloody murder at the old man.
When Sam did this, he knew things were really awkward. Glancing at his brother, Dean watched his knee bounce for a while then sighed heavily, dropping his feet to the floor and sitting upright. "Alright, let's have it. You're wound tighter than a vegan in a burger factory."