That’s the smile of a man who did something incredibly illegal and all the other guys are trying to get him out of there ASAP while worrying about the consequences if anyone finds out.

As for what that illegal thing was, well, this is just me putting a concept to a picture that might have had no illegal acts preceding it whatsoever, but you know. Drugs maybe. Full on making out with an underage groupie who was loving the experience, but then their dad entered the next room looking for them, necessitating a rapid getaway and a s**t-eating grin. Grabbing a dog’s tail from the inside and, roink, turning it inside out or making an audacious internet comment with a sound effect like “roink”. Those sorts of things.