Big Bang Theory Quote
Bernadette: Penny and I are having a girls' 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 can join us. I'll ask Penny.
Amy: No need. Penny and I are very close... In fact, our menses are synchronized.
Quote from S04E08 - The 21-Second Excitation