Clerk: oh, uh, I'm sorry, the computer aid isn't in right now
Patron: Huh?
Clerk: nobody can help you because the computer aid has gone home.
Patron: Oh, I don't need him.… I'm going to the restroom. I'm on that computer, though. Over there. [points] That one. That computer
Clerk: ok, but why are you telling me? You don't have to tell me that you're going to the restroom
Patron: *d' uh*[walks away]