[So that's why her face looks sort of but not really familiar - he's seen her in photos next door. He's surprised but triumphant for a moment with the realization.]

Oh, it's you!

[At least, until the follow-up question catches up to him. Then his eyes dart around, checking for eavesdroppers - avoiding eye contact.]

Uhh... Oh, I just mean, he's such a prankster. Some of the things he pulls off... I'm sure you've already suffered a few!