A GUY and a GIRL are walking to opposite ends of the stage.
 

GUY: Oh hey Jenny, how's it going?

JENNY: Oh hi. (confused) Sorry, how do we know each other again?

GUY: Don't you remember? I'm Graham. We sat next to each other in physics last Friday? I borrowed your pencil.

JENNY: Oh right, yeah Graham! (Pause). Wait a minute, that wasn't you.