Leonard: To Mrs. Wolowitz. A loving mother. To all of us. We'll miss you.

Penny: You're building a particle detector using super-fluid helium.
Leonard: You know, when you talk like that, I want to take you right here on this table.
Penny: And you know from past experience, this table can not support both our weight.

Leonard: This is exciting. This is really exciting. I have to go find Sheldon.
Penny: Okay, well, if you find him use the kitchen island. That coffee table will not support both of you.

Sheldon: The whole thing reeks of blueberry. You know I can't stand these scented markers.
Leonard: No one told you to taste them.

Sheldon: I like it. I think you're on to something.
Leonard: Really? You're not messing with me?
Sheldon: Not at all. In fact, I have got something for just such an occasion. I was starting to think I'd never get a chance to give it to you. Good job!
Leonard: You're giving me a sticker?
Sheldon: Not just a sticker. That's a sticker of a kitty saying "Mee-wow".
Leonard: I'm not a preschooler.
Sheldon: Fine, I'll take it back.
Leonard: I earned this. Back off.

Leonard: You wrote a paper on my idea?
Sheldon: I wrote a paper on our idea.
Leonard: When did my idea become our idea?
Sheldon: When I mixed it with Sheldony goodness and cooked it in the Easy Bake oven of my mind.

Leonard: This is good. Our idea is really good.
Sheldon: Well, the light bulb in this oven is ridiculously bright.

Sheldon: My name is right on there with yours. That is a sure fire mark of quality. That might as well say "Directed by Joss Whedon".

Leonard: Is your tongue blue?
Sheldon: I don't want to talk about it.

Amy: Whatever happened to that ape movie you were in?
Penny: Oh, God. Probably nothing. I think I saw the director twirling a sign outside the Verizon store.

Bernadette: Search for it.
Penny: What? No. Why?
Bernadette: Because it would be fun to watch.
Penny: It would be humiliating.
Bernadette: Well now we have two reasons.

Leonard: Sheldon, this is super-fluid helium. Put this in your mouth, your tongue will freeze and fall off.
Sheldon: Does it smell like blueberries?
Leonard: No.
Sheldon: Then we're probably okay.

Leonard: One calls it insightful and innovative. We're insightful and innovative.
Sheldon: Nice to meet you, Mr. Insightful.
Leonard: Ah, the pleasure is mine, Mr. Innovative.

Howard: How are you today, Mr. Can You Believe These Jackasses?
Raj: Just dandy, Mr. I Wish I Was Better At Improv.

Sheldon: Look, I am simply going to defend our work, scientist to scientist. And, failing that, suggest that his mother enjoys a string of both human and non-human lovers.