He doesn't recognize the voice, but then he turns to look at the guy who's just joined him - and oh, hey, Sam knows him, and that makes his amused smile get a little wider.

"You mean that literally, or in an every time I see one they try to steal my sandwich kind of way?"

Because rats couldn't say anything to him, before this, but now he's starting to reconsider.

He nods at the rats. "You seen something like this before?"