
"Explaining the rules to his expanded version of Rock-Paper-Scissors: 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."
"Insisting he knows what he’s talking about: “Howard, you know me to be a very smart man. Don’t you think that if I were wrong, I’d know it?"
"After Leonard asks him why a letter is in the trash: Well, there’s always the possibility that a trash can spontaneously formed around the letter, but Occam’s Razor would suggest that someone threw it out."
"Sheldon: I can't seem to get in touch with Amy. I tried e-mail, video chat, tweeting her, posting on her Facebook wall, texting her, nothing.
Leonard: Did you try calling her on the telephone?
Sheldon: The telephone. You know, Leonard, in your own simple way, you may be the wisest of us all."