Sheldon: Amy, there was a song I couldn't get out of my head. Eventually, I realized the song was about you, and like that earworm, I can't get you out of my heart. So, what I'm trying to say is, you're my heartworm. The metaphorical kind, not the poodle-killing kind.

Sheldon: Amy, if you want to be my girlfriend again, I really want to be your boyfriend.
Amy: I really want that, too.
Sheldon: Good, because I love you.
Amy: I love you, too.
Dave: Kiss her, you brilliant fool!
(Sheldon kisses Amy)
Sheldon: Well, I'll let you get back to your date.

Leonard: Am I like the dryer sheets of your heart?
Penny: Better. You're the lint trap of my love.

Sheldon: Well, I shouldn't be surprised. There's a rich history of brilliant minds descending into madness.
Penny: Come on, Sheldon. There are plenty of smart people who don't have mental problems.
Leonard: Yup, she's right. For every Newton who had a psychological issue, there's an Edison who was just a jerk. That could totally be you.

Sheldon: I remember the song! It's called "Darlin'" by the Beach Boys! Oh, thank goodness! I'm not crazy! I don't have to take a pigeon as my bride!
Leonard: There goes our shot at him living on the roof.

Penny: Do you even like the Beach Boys?
Sheldon: They have "beach" right in the name. What do you think?

Sheldon: I know why the song was in my head.
Penny: Why?
Sheldon: It's about Amy.
Penny: Okay, look, I know Amy's like an old lady, but she's not old enough to have a song from the '60s written about her.

Penny: Well, she did soften your life, didn't she?
Sheldon: Yes! She's like the dryer sheets of my heart!

Howard: So if you think that's creepy, you married the wrong guy.
Bernadette: Maybe I should marry Trent.
Raj: Yeah, like she could get Trent.

Dave: This is delicious.
Amy: Thank you.
Dave: Been a long time since I had a home-cooked meal.
Amy: When you were married, did your wife cook?
Dave: Not at first, no. But when she began cheating on me with a French chef, she became quite the wiz in the kitchen.
Amy: So, a little silver lining.
Dave: I suppose. Yeah, nothing takes the sting out of a shattered life like a properly-seasoned bowl of onion soup.

Sheldon: This song is never going to stop. Have you ever dealt with something so relentlessly irritating?
Leonard: That's a trick question, right?

Howard: Look at this. Trent is rebuilding a vintage motorcycle.
Raj: That is so cool! Old broken things are so much better than new things that work.

Bernadette: Who's Trent?
Howard: Oh, he's our fan.
Bernadette: Fan of what?
Howard: Uh, did you forget? We're in a band.
Bernadette: You mean because you played one time in the comic book store?
Howard: And at the children's hospital until they asked us to leave.

Sheldon: Dear Crazy Future Sheldon, this is a thermostat. It controls the temperature of the apartment. The ideal setting is 72 degrees. If you find this too cold, then put on a jacket. A straitjacket, 'cause 72's the best and you're crazy.

Sheldon: Now this is your spot. You're very protective of it. When anyone else tries to sit here, you berate them relentlessly. It sounds mean, but somehow you make it adorable.