I'm cool with surprises, but nothing on the Jumbotron. I don't want to cry on the big screen like that.

You have to propose to me.

Leonard: You know what? That was pretty crappy of you. All I wanted to do was to give you a great night and it was like you went out of your way to destroy it.
Penny: Yeah, I know. I'm a total bitch.
Leonard: I'm not saying that.
Penny: Well, I am.
Leonard: Oh, fine you win. You're a bitch.

Leonard: Two can play this game.
Penny: Get up.

Howard: A micro-valentine for a microbiologist.
Leonard: From her micro-husband.

Well, this time is going to be different because I'm a like a romance ninja. You don't see it coming and then BAM. Romance, watch out, hearts, kisses, love, ewww wah.

Penny: No, I said "Oh my God, I think that old guy's choking" and one of the busboy's Heimlich'd him.
Leonard: You're a hero...
Penny: Yeah ... that was the point of the story.

Sheldon: Have you seen the one where Lori dies?
Leonard: No.
Sheldon: Or, maybe she doesn't. Let's find out.

Oh, spoiler alert. This door's about to slam in your face.

Leonard: Maybe it's a shipping problem.
Howard: What?
Leonard: Maybe Wesley Snipes and Toucan Sam just got action figures that look like you guys.

Fine, but set them to stun. If we vaporize Penny, I'll never find a girlfriend that pretty again.

Raj: Are they actually arguing about comic books?
Leonard: No, that can't be right.
Howard: Maybe "Thor's Hammer" is a new color of nail polish.

TBBT Quotes

Penny: Hey, Sheldon, did you change your Wi-Fi password again?
Sheldon: Yes, it's "Penny, get your own Wi-Fi." No spaces.

It's very simple. Scissors cuts paper, paper covers rock, rock crushes lizard, lizard poisons Spock, Spock smashes scissors, scissors decapitates lizard, lizard eats paper, paper disproves Spock, Spock vaporizes rock, and, as it always has, rock crushes scissors

Sheldon