Leonard: You call that a glow stick? *Pulls out a Lightsaber* That is a glow stick!

Leonard: What would you be if you were attached to another object by an inclined plane, wrapped helically around an axis?
Sheldon: Screwed?
Leonard: There you go.

Leonard: Penny. We are made of particles that have existed since the moment the universe began. I like to think those atoms traveled fourteen billion years through time and space to create us, so that we could be together and make each other whole.

Sheldon: This song is never going to stop. Have you ever dealt with something so relentlessly irritating?
Leonard: That's a trick question, right?

Sheldon: I would have been here sooner but the bus kept stopping for other people to get on it.

Penny: Sheldon, that's not what girlfriends are for. Although you don't use them for what they're for, so what do I know?

Raj: They don't call me Brown Dynamite for nothin'.