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.

Bernadette: Anybody have anything snarky to say about that? Didn't think so.

Alfred Hofstadter: I'd like to say something. Beverly, I know that we don't bring out the best in each other. But something wonderful did come from our relationship, that young man right there.
Beverly Hofstadter: I couldn't agree more.
Stuart: (tearing up) That's beautiful.

Sheldon: Leonard, you and I have our ups and downs. But I have always considered you my family. Even before the recent threat of our parents fornicating like wrinkly old rabbits. I don't always show it, but you are of great importance to me. Both of you.

Beverly Hofstadter: Thank you for taking us to the airport.
Leonard: Hey, I'm just thrilled we're all getting along for a minute.
Alfred Hofstadter: Yeah, me, too. Beverly, I'm sorry if I upset you.
Beverly Hofstadter: Water under the bridge, Alfred. Leonard, why don't you get into the carpool lane?
Alfred Hofstadter: Well, that's a solid line. He can't cross it.
Leonard: That's okay. I can make it over.
Beverly Hofstadter: No, no, let's plod along. It'll make your father feel more comfortable.
Alfred Hofstadter: What makes me comfortable is knowing I don't have to wake up tomorrow morning and see your sour face.
Beverly Hofstadter: Do the world a favor, and don't wake up tomorrow morning.
Leonard: That was almost a minute.

Mary Cooper: There's a lot of traffic. Are we gonna be okay?
Amy: You'll be at the airport an hour before your flight.
Mary Cooper: Good. Thank you.
Sheldon: Plenty of time for you to meet another geriatric boy toy.
Mary Cooper: Hey, I will not have you be disrespectful to me.
Sheldon: Yes ma'am.

Amy: Sheldon, your mother's an attractive woman. You need to get used to the fact that men are going to be interest in her.
Sheldon: Well, and you need to drive the car and mind your business.
Amy: I will not have you be disrespectful to me.
Sheldon: What- you're not my mother.
Mary Cooper: Don't you be disrespectful to her.
Sheldon: Yes ma'am.
Mary Cooper: You'll get there. You've just gotta put some zing on it.