Penny: Should we take this little party to the bedroom?
Leonard: We don't have to. We have the whole place to ourselves.
Penny: Oh, that's true.
Leonard: In fact, if you want, we can do it right here on Sheldon's spot.
Penny: That is the least sexy thing anyone's ever said to me.

Howard: Fun Fact: I'm going to jump off this train!

Leonard: Cinnamon, guess who just did it "human-style".

Amy: (About Sheldon) Why do I even try?
Bernadette: I'm going to fix this right now.
Howard: Okay, but just make it look like an accident.

Raj: Oh my God, Cinnamon, are you okay? I can't believe you two (Leonard & Penny). (To the vet) You do whatever it takes to save her life. If she needs any new organs I'll buy any dog necessary and scrap them for parts!

Bernadette: Now there's two of them.

Leonard: Hang on, hang on. Are all those things equal to you?
Sheldon: Hmm, it never occurred to me to pick a favorite.
Leonard: Give it a go.
Sheldon: I can't answer that without collecting additional data.
Leonard: "Additional data", you dog!
Sheldon: I'm not sure how listening to other nine-fingered banjo players makes me a dog, but all right.

Sheldon: Well, my new friend's name was Eric, Amy's lips tasted like the brownie we had for dessert, and the banjo-playing conductor was missing a finger but made up for it with his can-do attitude.

Sheldon: I made a new friend who likes trains as much as I do, I kissed Amy on the lips, and the conductor played his banjo for me.

Raj: I'll point out her name's Yvette and that she's a vet. That's hysterical! She'll love it.

Raj: Cinnamon, she gave me her phone number! If I'd known it was that easy, I'd have considered poisoning you months ago.

Sheldon: The conductor said if I come back to the engine room, he'd show me how to take the train through a crossing.
Amy: Okay. Have fun.
Sheldon: Do you want to come with me?
Amy: Really? I do!

Sheldon: Well, if you want romance then let's have romance. Oh look, there's wine. Mmm, grape juice that burns! Now let's gaze into each other's eyes. You blinked, I win.
Amy: Sheldon!
Sheldon: Let's see what's next. Oh, kissing's romantic.
*Sheldon kisses Amy*
Amy: That was nice.
Sheldon: Good.

Yvette: You're the owner?
Raj: Owner. Father. Soul mate. And, if anything happens to her, your (Leonard & Penny) worst nightmare!

Howard: You okay?
Amy: Why? Because my boyfriend's off playing choo choo with some weirdo.
Howard: Well, to be fair, they're both weirdos.