Barry Kripke: You afwaid of heights,Cooper?Sheldon Cooper: Hardly. A fear of heights is illogical. Fear of falling, on the other hand, is prudent and evolutionary.
Read more Sheldon Cooper QuotesFrom: The Big Bang Theory
Leonard Hofstadter: OK, we're headed out. See you later.Sheldon Cooper: I know. Before you leave, can you help me test these noise cancelling headphones?Leonard Hofstadter: Yeah, sure.Sheldon Cooper: Go ahead.Leonard Hofstadter: Hello, can you hear me?Leonard Hofstadter: Sheldon, I haven't changed the filter in the water pitcher in two years.Penny: Uh, Bernadette's nickname for you is the Virgin Pina Colada.Leonard Hofstadter: Your George Lucas autograph is really a me autograph.Penny: Yeah, well, once I was too lazy to walk across the hall so I used your toothbrush.Leonard Hofstadter: Ooh, and at one time when you were asleep Amy totally took off her-Leonard Hofstadter: And that's why you're the best roommate ever.Sheldon Cooper: Aaaaw. Now I'm sad I didn't hear it.
Penny: What's wrong with geology?Sheldon Cooper: Let me put this in a way you'll understand Penny. You remember how you explained to me that the Kardashians aren't real celebrities? Well, geology is the Kardashians of science.
Leonard Hofstadter: Sheldon! How could you just sit there and let them spy on me?Sheldon Cooper: They were clever, Leonard: they exploited my complete lack of interest in what you were doing.