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.