[Boo, scared of the closet, shows Sully a picture]
Sulley: Hey, that looks like Randall. Randall's your monster. You think he's gonna come out of the closet and scare you?
[Opens closet and walks inside]
Sulley: Look, it's empty. No monster in here. Okay, NOW there is. I'm not gonna scare you. I'm off duty.