Leonard: Sometimes your movements are so lifelike I forget you are not a real boy.

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, as a scientist, my job is to figure out why things happen. But I don't think I'll ever understand how someone like me could get to be with someone like you. You know maybe I don't need to understand it, I just need to be grateful. I love you, Penny.

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

Raj: Oh, you're so arrogant. If you were a super hero your name would be Captain Arrogant. And do you know what your super power would be? Arrogance.

Sheldon: Oh, Penny. Penny.
Penny: What's up?
Sheldon: Nothing. I just wanted to make Raj stop talking.

Raj: Sorry, dude. The thermostat's on my side of the room, so it stays Mumbai hot in here until you turn off that stupid Indian music.
Sheldon: I'll turn off the music when you get rid of that salmonella-ridden parakeet.
Raj: Oh, too bad. Sheldon's pathologically afraid of birds. Hey, look, Sheldon. Birdie, birdie, birdie.
Sheldon: That's it. Prepare for marshmallow death.
Raj: Eat flaming Nerf.