Big Bang Theory Quote
Sheldon: (as Penny makes up the couch to sleep on she puts the pillow on the end of the couch closest to the door) Hmm-hmm, wrong.
Penny: (Turning to face Sheldon with a glare) I'm listening.
Sheldon: Your head goes on the other end.
Penny: Why?
Sheldon: It's culturally universal. A bed, even a temporary bed, is always oriented with the headboard away from the door. It serves the ancient imperative of protecting oneself against marauders.
Penny: I'll risk it.
Sheldon: (high pitched) Hmm.
(and turns away)
Quote from S01E07 - The Dumpling Paradox