Raj: You know, downward-facing dog comes from the Sanskrit phrase adho mukha shvanasana.
Penny: Oh, that's beautiful. What does it mean?
Raj: "Downward-facing dog."
Penny: Yeah, I guess they don't have Sanskrit for "butts up and heads down."
Raj: Hey, we wrote the Kama Sutra. If it involves butts, there's a word for it.

Raj: Oh man, first monster I see I'm gonna sneak up behind him, whip out my wand and shoot my magic all over his ass!
Stuart: Do you hear yourself when you say these things?

Raj: Amy, good luck getting these guys excited about a dinner with a theme. I gave up when no one cared about my Tom Hanks-Giving.

Penny: What do you mean new roommate? What happened to Leonard?
Sheldon: The same thing that happened to Homo Erectus. He was replaced by a superior species.
Raj: I'm the new homo in town.

Amy: Wait, are you saying if we combine my experiment with your calculations, we can determine the precise moment in time when the wave function collapses?
Sheldon: It could be the most inspired combination since I mixed red Icee into my blue Icee. It was like drinking 2/7ths of the rainbow.
Amy: Sheldon, this is really interesting.
Sheldon: Yeah and this one won't stain my teeth purple.

Leonard: Oh, it's just nice to be with people who are happy to have me around. Isn't that right, Halley?
*Halley starts crying*
Howard: Well, at least someone had the courage to say it.

Raj: It's nice to see you taking an interest in Amy's work.
Sheldon: Well, don't get me wrong. Neurobiology's nothing more than the science of gray squishy stuff. But, you know, when it connects to physics, gas up the Ford, Martha, we're going for a drive.