Crowd at the airport: There he is! Howie! Howie!
Wolowitz: Whoa, thank you. Great to be back on Earth.
Howie Mandel: Uh, I think they're here for me, Ringo.

Howard: There's no way this is sixty feet.
Bernadette: I'm looking at it!
Howard: You realize this isn't one of those times I want you to exaggerate how long something is.

Raj: All the other comments said really nice things. Focus on those.
Howard: Yeah. Dr. Dimitri Plankovic of Moscow University said "This paper great. I love it more than vodka."
Raj: See, better with the accent.

Leonard: Does your family have a history of heart disease?
Wolowitz: My family is the history of heart disease. There's a cave painting in France of one of my ancestors doing this. *Mimics heart attack*

Raj: Hold on a second. Kreplach??
Howard: Yeah.
Raj: That isn't Klingon. It's yiddish for meat-filled dumpling!
Howard: Well, as it turns out it's also a Klingon word.
Leonard: Really? Define it.
Howard: Kreplach a hearty Klingon.....dumpling.

Howard: (To Bernadette) A Catholic girl like you wearing a big cross like that might just give my mother the big brain aneurysm I've been hoping for.

Howard: (Mimicking Bernadette in a high voice) Oh Howie, stop talking about space so much. Nobody likes it.
Bernadette: (In a low voice) I don't sound like that.

Penny: Aww, what horrible thing are you trying to make up for?
Howard: Just putting something in the bank for what horrible thing I do next.

Sheldon: (knocking) All my friends. (knocking) All my friends. (knocking) All my friends.
Howard: Wow, I think it's like Beetlejuice. We must've said his name too many times.

Howard: Now, I downloaded an app that might be helpful in this situation.
[whip cracks]
Sheldon: You're right. I'm smart as a whip. I should be able to figure this out.

Wolowitz: I am the sword master!

Howard: Kind of a "Mars rover, Mars rover, can Howard come over?" situation.

Howard: The one thing the William Shatner of theoretical physics needed was an ego boost.

Howard: (Southern Accent) If y'all don't mind, I got a hankering for a lone star beer.
Mary: There's no alcohol in this household, stop talking like that, and lose the hat.
Howard: Sorry, I'll take a diet yoo-hoo if you have one.
Mary: You'll take a Coke.

Howard: Gather around, kids. It's time for Sheldon's beloved Christmas special.
Sheldon: In the pre-Christian era, as the winter solstice approached and the plants died, pagans brought evergreen boughs into their homes as an act of sympathetic magic, intended to guard the life essences of the plants until spring. This custom was later appropriated by Northern Europeans and eventually it becomes the so-called Christmas tree.
Howard: And that, Charlie Brown, is what boredom is all about.