Leonard: That's actually a valid example. Animals do deliver messages through scent.
Raj: Bees talk to each other by dancing. Whales have their songs.
Leonard: Penny has about 20 different ways of rolling her eyes that each mean something different.

Penny: So we're about to film this scene in the movie where the killer ape DNA is slowly taking over my body.
Leonard: Okay.
Penny: But I realize they're gluing fur everywhere except my cleavage. So I ask the director and he says it's important to the story that my boobs be the last things to turn ape.
Leonard: It's sweet that he thinks there's a story.

Leonard: Well, Penny can be very persuasive. She's gotten me to do a lot of things I wouldn't normally do.
Amy: Because she has sex with you.
Leonard: Yeah, she does.

Leonard: It took him a long time to get comfortable around me, too.
Amy: Really? What did you do?
Leonard: Something terrible in a former life? I don't know.

Howard: Wow. I wonder what that guy could've done to make Sheldon not talk to him for 20 years.
Leonard: I wonder if it'd work a second time.

Leonard: Listen. If you're imagining that it was sexy, it wasn't. We were both drunk and she smelled like an ashtray. The boat was moving a lot, so I chipped her tooth.
Penny: Did you feel guilty?
Leonard: Well, she had dental insurance.

Guy: Is this guy for real?
Leonard: Boy, I wish I could say no.

Leonard: I got all your favorites. Beer, wings, sliders. We can watch the football game. I even painted my stomach.
Penny: Go Sports?
Leonard: Well, in case you were in the mood for baseball, I didn't want to look ridiculous.

Howard: I love watching Raj and Sheldon try to work together.
Leonard: Yeah, it's like if Alien and Predator decided to go partners in a Jamba Juice.

Leonard: Ladies do love a guy dressed like a kitchen garbage bag.

Penny: Okay, what just happened?
Leonard: I don't know. Between you playing chess like Bobby Fischer and Sheldon being okay with you in his spot, I'm guessing someone went back in time, stepped on a bug, and changed the course of human events.

Leonard: Hang on. Are you feeling insecure? Because that's my thing, and if you take it away, I don't know what I'm bringing to this relationship.

Priya: It's a little weird your ex-girlfriend hanging out here all the time.
Leonard: I know. I usually never see my ex-girlfriends, unless their hard drives crash.

Leonard: Well, I'm excited to show you around.
Penny: You think we'll have time to visit your mom over there?
Leonard: Yes. We'll also have time to put my junk in a garlic press, but I'm not doing that either.

Raj: Maybe moving in was a bad idea. I haven't been here one day, I'm already causing problems.
Penny: You didn't do anything. It's Sheldon.
Leonard: "You didn't do anything.It's Sheldon." That'd make a nice needlepoint pillow.