Leonard: I'm not going to make a fake appointment with a psychiatrist. What would I say is wrong with me?
Koothrappali: Low self esteem.
Howard: Social anxiety.
Sheldon: Sexual insecurity.
Leonard: None of that is true.
Penny: Denial. See sweetie, the list goes on and on.

Sheldon: Won't that void the warranty?
Howard: Sheldon, I have a masters degree in engineering. I wipe my bottom with warranties. Except for Apple Care. That pays for itself in the long run.

Bernadette: Howard, you're grown men. You guys don't have to do everything together.
Howard: I know, that's why I'm spending tonight with you.

Sheldon: I'll give you three guesses why I'm so irritated.
Howard: Something happened different from the way you wanted it.
Sheldon: I guess news travels fast.

Bernadette: Did she throw anything away?
Howard: Nope. If I find my foreskin, I'm gonna kill myself.

Okay, then, how about this. Let's invite everyone over to dinner. It'll be like Ma's feeding us one last time.

Bernadette: A two-hundred dollar R2D2 is a business expense?
Howard: Oh, Bernie. You're gonna have to sound a lot more confident when we get audited.

No. My mom died.

Leonard: Stephen Hawking liked our paper. Said the premise is intriguing.
Sheldon: Good to see you again, Mr. Stephen-Hawking- Liked-Our-Paper.
Leonard: And you as well, Mr. Our-Premise-Is-Intriguing.
Howard: How do you do, Mr. I'll- Admit-That's-Pretty-Cool?
Raj: Yeah, you keep setting me up for failure.

Howard: Why do you keep assuming it was me?
Leonard: Because you do this kind of thing all the time, and then you try to cover it up.
Howard: Like when?
Leonard: What about when you flipped the Mars Rover, or lost Koothrappali's dog, or almost drove off with that baby?
Howard: Again, it looked like my car, and the baby didn't even cry until his mother punched me with her keys.

Howard: Well, what if we turn off all the lights except for one, and it'll come to it.
Leonard: It's not a moth!
Howard: Don't yell at me. You're not gonna get any good ideas out of me if you're yelling.
Leonard: Okay, so if I remain calm, I'll get more gems like, "Turn off the lights"?!
Howard: Great, we're turning on each other. That's just what the bird wants us to do!

Howard: How the hell did a pigeon get in here?
Leonard: You shut the loading doors, right?
Howard: I thought you did.
Leonard: Do you know what a disaster this is?!
Howard: You mean 'cause this room isn't supposed to have dust in it, and we just let in a flying crap machine

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.

Bernadette: I had a plan. I kept leaving Dove bar wrappers around to explain any weight gain.
Amy: Where did you get empty Dove bar wrappers?
Bernadette: From all the DOVE BARS I ATE. I'M PREGNANT. Try to keep up!