Big Bang Theory Quote
Sheldon: (knocking on Penny's door) Penny. Penny. Penny.
Penny: You do realize I stand on the other side of the door waiting for you to finish knocking three times.
Sheldon: I know. I can see the shadow of your feet under the door.
Penny: Yeah, my point is it's a waste of time.
Sheldon: If you're looking for an example of a waste of time, I would refer you to the conversation we're having right now.
Quote from S04E01 - The Robotic Manipulation