“Given that missing you is predicated on you leaving, Logic dictates you must leave.”

- Dr. Sheldon Cooper, Ph.D, The Big Bang Theory 2x23

“You know me to be a very smart man. Don’t you think that if I were wrong, I’d know it?”

- Dr. Sheldon Cooper Ph.D, The Big Bang Theory 3x02

“I can’t be impossible, I exist. I believe what you meant to say is, “I give up, he’s improbable.”“

- Dr. Sheldon Cooper, Ph.D, The Big Bang Theory 3x03

“One cries because one is sad. For example, I cry because others are stupid, and that makes me sad.”

- Dr. Sheldon Cooper Ph.D, The Big Bang Theory 3x10

“Hello, Maker of the Universe. I see what you did there. Good one!”

- Dr. Leonard Hofstadter, The Big Bang Theory 4x07

“Einstein defined insanity as doing the same thing over and over again expecting different results.”

- Dr. Sheldon Cooper, 4x09