Sheldon: (Knocking on Penny's door early in the morning). Penny, Penny, Penny!
(Penny opens the door).
Sheldon: Good morning.
Penny: Do you have any idea what time it is?
Sheldon: Of course I do. My watch is linked to the atomic clock in Boulder, Colorado. It's accurate to one-tenth of a second, but as I'm saying this it occurs to me once again your question may have been rhetorical.