[Should he die laughing or despair forever, he's not entirely sure.]
Okay, for one, you just said it's you! And second, uh, there hasn't been anyone new arriving, I've been here long enough I know pretty much everyone our age, and why would there be a new guy who looks just like that asshole brother of yours, except slightly nicer and leaner, and also happens to have started working here? Doing exactly what you always do?
[He pauses for dramatic effect.] Yeah, wow, can't see at all how I could've been able to tell it's you.