Crawley: Ha-ha. Don't knock, just walk in. Why be polite to the world's leading expert on the dung beetle?

Bernadette: Besides, Penny and I are having a girl's night tonight.
Amy: Girls night, what does that entail?
Bernadette: Oh you know, girls get together hang out share girl talk.
Amy: I'm a girl.
Bernadette: Oh well maybe you could join us. I'll ask Penny.
Amy: No need, Penny and I are very close.
Leonard: You are?
Amy: Yes, In fact our mensies are synchronized.

Penny: You locked them in your basement?
Dr. Lorvis: Well, they're not locked in. The door just sticks.
Penny: Okay, so how do they unstick it?
Dr. Lorvis: They'd need the key.

Penny: Okay, you can't just go chasing after every girl who's nice to you.
Dr. Lorvis: Well, that's not what Sheldon says, and he seems to know his way around the ladies.

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.

Raj: Ooo, big talk from a man who was once treed by a chicken.

Sheldon: I am not crazy, my mother had me tested.