Penny: Okay, Sheldon and Amy are still pretty upset about their theory being disproved.
Leonard: So we have made a list of subjects for everyone to avoid.
Penny: Symmetry.
Leonard: Asymmetry.
Penny: Uh, SimCity, sounds too much like symmetry.
Leonard: That also applies to The Simpsons, Simba from The Lion King, and cymbals.
Penny: Russia or Russian in any context. The country, the dressing, the roulette.

Leonard: What am I supposed to do?
Penny: Err, keep your mouth off other women.

Penny: At one point, they had me figure out how to get a banana out of a puzzle box.
Leonard: Wait, Sheldon gave me a banana in a box. He was testing me, too.
Penny: Unbelievable.
Leonard: And how could a chimp even solve that? That was impossible.
Penny: Really? You couldn't get it out?

Sheldon: Woman, you are playing with forces beyond your ken.
Penny: Yeah, well your Ken can kiss my Barbie.

Sheldon: Thanks, Dad. We're gonna give them hell.

Leonard: I have something that might help. It's-it's a recording of the only person whose opinion Sheldon actually respects.
Amy: Hawking? Feynman?
Leonard: No, himself.

Amy: Hey.
Sheldon: Hello.
Amy: "Fine with flags"?
Sheldon: Yes, flags, up there flapping around on poles. If you think about it, they're just the strippers of the emblem world.