Leonard: Just think, this time tomorrow we'll be in Geneva, Switzerland for our first Valentine's Day.
Penny: I know! I went shopping today and bought special undies for the occasion.
Leonard: Thermal? 'cause it's gonna be cold.
Penny: Think it through, Leonard.

Raj: Oh, my goodness, look at this room! Champagne! Roses! Oh and little chocolates! This is going to be the best Valentine's Day ever.
Leonard: Yeah, I forgot about all this.
Raj: But I never will.

Sheldon: Cathedra mea, regulae meae. That's Latin for my chair, my rules.

Sheldon: Oh, good, you're home. I need you to do me a favor.
Leonard: Sure.
Sheldon: Go apologize to Penny.
Leonard: What?
Sheldon: Right now would be good.
Penny: (knocking) Leonard!
Sheldon: Although, a few minutes ago would have been better.

Leonard: Not only did Sheldon save my life, he didn't rat me out to the landlord. Or the police. Or Homeland Security.
Penny: Okay, so, basically, you're the reason I have to walk up and down three flights of stairs every day?