Amy: Sorry I'm late. (Sees Sheldon's new hair style) What did you do?
Penny: I gave him a new look. Cute, huh?
Amy: Yeah, it's cute. That's the problem. I don't need other girls to see him walking around like sex on a stick?
Sheldon: (Looks in a mirror) She's right, I'm too hot.

Raj: I don't like bugs, okay. They freak me out.
Sheldon: Interesting. You're afraid of insects and women. Ladybugs must render you catatonic.

Sheldon: Scissors cuts paper, paper covers rock, rock crushes lizard, lizard poisons Spock, Spock smashes scissors, scissors decapitates lizard, lizard eats paper, paper disproves Spock, Spock vaporizes rock, and as it always has, rock crushes scissors.

Sheldon: Why are you crying?
Penny: Because I'm stupid.
Sheldon: That's no reason to cry. One cries because one is sad. For example, I cry because others are stupid, and that makes me sad.

Raj: We have to go over some ground rules about Emily.
Howard: Like when it turns out she's made of rubber, I don't say anything?
Raj: She's very real.
Howard: That's what it says on the box. Right next to dishwasher safe.

Sheldon: (on Stephen Hawking's voice mail) I kiss girls now.

Leonard: How's dating two women going?
Raj: Umm, kinda hit a bump. When I was honest and told Emily she wasn't the only person I was seeing, it went great. So I tried the same thing with Lucy.
Howard: And?
Raj: She had mixed feelings. But when I said "Emily was cool with it, Emily's the best, why can't you be more like Emily?", those feelings became less mixed.