Leonard: Next we need a teaspoon of pepper, which, I believe, was also the name of your childhood dog.

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.

Leonard: What would you be if you were attached to another object by an inclined plane, wrapped helically around an axis?
Sheldon: Screwed?
Leonard: There you go.

Leonard: My point is, while you're spending all this time on your own, building computers or practicing your cello, what you're really doing is becoming interesting. When people finally do notice you, they're gonna find someone a lot cooler than they thought. And for those of you that were popular in high school, it's over, sorry. Thank you. Congratulations.

Sheldon: Amy, I excel at many things, but getting over you wasn't one of them. I think I need to just be your friend.

Amy: Let's see. I have been on six dates with three different people. It was either for coffee or dinner. One I met at a bookstore and two I met online. I haven't slept with anyone. The aquarium is 40 minutes away. And there's a baggie of Cheerios for you in the glove compartment.
Sheldon: Uh, regular or honey nut?
Amy: I mixed them.
Sheldon: You mixed them. No wonder gentleman callers are pounding down your door.

Raj: Have you guys seen this feature that lets you talk to Siri without pressing any buttons?
Howard: No. How does it work?
Raj: You just say, uh, "Hey, Siri, what time is it?"
Siri: The time is 6:37 p.m.
Howard: So now anyone can control your phone? Hey, Siri, show me pictures of naked grandma butts.
Raj: Nice try. It only recognizes my voice.
Howard: Oh, cool. (Imitates Raj): Hey, Siri, show me pictures of naked grandma butts.
Raj: I don't sound like that.
Siri: Here are some images of naked grandma butts.