A tumor would explain a lot.

Amy

Later, Losers!

Raj

Penny: Leonard Hofstadler...
Leonard: Yes?
Penny: Will you be my valentine?
Leonard: Sorry. Maybe, next year. ... I'm just kidding. Romance ninja. Let's have sex! Wah!

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

Leonard

You have to propose to me.

Leonard [to Penny]

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.

Sorry doesn't clean my underpants, buddy.

Bernadette

If you like pushing buttons so much, try pushing them on the washing machine.

Bernadette

She hid my Xbox like I'm a child. And, my mom got me that for my birthday so if you don't give it back, I'm telling.

Howard

Sheldon: Wow. This is truly remarkable.
Alex: Thank you.
Sheldon: I think I'll keep it for myself.
Alex: What about your girlfriend?
Sheldon: It's too late, I call dibbs.

Sheldon: But, she has Google maps on her phone.
Alex: I don't know how to respond to that.

The Big Bang Theory Season 6 Episode 16 Quotes

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.

Leonard

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.