The Knock! Sheldon has a particular door knock ritual. Due to his obsessive compulsive tendencies, he must finish his knock, even if someone opens the door before he is finished, in which case he will usually finish it on the door frame.
Tags: penny-the-big-bang-theory, sheldoncooper, doctor-sheldon-cooper, sheldon-knock, the-big-bang-theory
Scissors cuts paper, paper covers rock, rock crushes lizard, lizard poisons Spock, Spock smashes scissors, scissors decapitates lizard, lizard eats paper, paper disproves Spock, Spock vaporizes rock, and as it always has, rock crushes scissors.
Tags: big-bang-theory, sheldon-cooper, spock, mr-spock, sheldon