Christa's reactions when discussing her scars (from a werewolf):
Adam: Seriously, Christa, we both know how you got that scar on your arm.
Matt: And the rest. [holding his hand to his chest, showing where they are]
(Adam and Christa both look at Matt)
Christa: What? (looking shocked)
Christa: When did you see? When did you see?
Adam: See what?
Christa: I think I know exactly what he was doing that day, don't I, Matt?
It turns out Matt was spying on her in the locker room.