Sam glances over at him, barely stopping from rolling his eyes at the face pull. "I suppose so, yeah. I always had to share Dad's attention, so I guess it's just a sibling thing."

It's also just a Dean thing. He loves his brother, but he needs to be laughed at occasionally.

He snorts and shakes his head. "No, not like the Mafia." A pause as he considers. "Okay, no, really not like the Mafia. More like...the monsters under your bed sort of thing."

Look, it's hard to explain this sort of thing to people who have never dealt with the things that Sam and Dean fight.