Amy: Oh, so now you're reevaluating every opinion you've ever had?
Sheldon: Yes. I am following the example of 17th century philosopher René Descartes.
He subjected all his beliefs to radical doubt so that he could build a bedrock belief and build his cognitive life back up on firm principles. [eating asparagus] Ugh! Still yucky, still yucky.

Amy: Sheldon, I know you're upset about the paper, okay. I'm upset, too.
Sheldon: I mean, I was so sure we were right. Every fiber of my being felt like this was it. This was the one. How can I trust my instincts anymore?
Amy: Well, just because our theory was wrong, that doesn't mean you're wrong about everything.
Sheldon: Doesn't it? I've always thought I hated jazz, maybe I was wrong. Maybe it's great to hear all the notes at once. [music plays] I'm trying, I'm really trying!

Penny: What you eating?
Leonard: Chicken fried steak.
Penny: What? You can't have chicken fried steak first thing in the morning.
Leonard: Hey, you knew I was a bad boy when you married me. Come on, you want a piece of this?
Penny: You or the steak?
Leonard: Me. I'm not sharing the steak.

Amy: I'm really worried about Sheldon. I've never seen him this down.
Penny: Have you tried making him a cup of tea?
Amy: He's reevaluated tea. Now he thinks it's nothing but leaf soup.
Leonard: That's a good point.
Penny: No, it's not.
Leonard: No, it's not.

Leonard: I have something that might help. It's-it's a recording of the only person whose opinion Sheldon actually respects.
Amy: Hawking? Feynman?
Leonard: No, himself.

Leonard: It's a pep talk he made when he was a kid. He gave it to me years ago and told me to save it for a real emergency.
Penny: What? You didn't break it out when he declared his room a sovereign nation and waged a trade war against us?
Leonard: His major export is talking. I didn't want that anyway.

Bernadette: Is that a VCR?
Howard: Yeah, Amy asked if we had one she could borrow and I just want to make sure it still works.
Bernadette: What's on the tape?
Howard: Not sure. I used to record a lot of Jeopardy! for my mom, but if I push play and you see some naked people-
Bernadette: Got it. "What is porn?"
Howard: Ooh, we were looking for "vintage '80s erotica," but I'll accept it.

Bernadette: Put it back on. You look adorable.
Howard: It's just a practice tape from when I was trying to become a member of the Magic Castle.
Bernadette: I didn't know you auditioned there.
Howard: Oh, I never went through with it. I watched the tape and realized I wasn't good enough. You know that trick where you saw a mannequin in half?
Bernadette: Don't you mean a lady?
Howard: Thank God it was not a lady. I'd just be getting out of jail.

Bernadette: Come on, you're a good magician.
Howard: Really? You always called magic dumb.
Bernadette: You can be good at something dumb.

Bernadette: You know what, you should audition now.
Howard: It's fine. I don't need to be a member of the most elite magical society on the face of the earth.
Bernadette: Sounds like you still want it. And I don't want our kids to watch this tape one day and think their dad is a quitter.
Howard: Oh, we don't have to show it to them.
Bernadette: Oh, I'm definitely showing it to them.

Amy: Hey.
Sheldon: Hello.
Amy: "Fine with flags"?
Sheldon: Yes, flags, up there flapping around on poles. If you think about it, they're just the strippers of the emblem world.

Amy: Well, I got something that I think might cheer you up. It is the emergency pep talk you made when you were a kid.
Sheldon: Oh, that. I was saving it for the day they stop making Star Wars movies. I don't think that's ever gonna happen.

Amy: How long has it been since you've seen it?
Sheldon: Not since the day I recorded it. No, I had just watched Back to the Future II, where Marty McFly gets a glimpse of his future self and that got me thinking, the day may come where I needed my help, like they did with that movie. That was not great.

Amy: Okay, all hooked up. Here we go. Oh, look how cute you were!
Sheldon: Amy, please, of course I was cute. Look how I turned out.

Young Sheldon: Hello, Sheldon.
Sheldon: Hello, Sheldon.
Young Sheldon: If you're watching this, I assume something bad has happened. Something unfortunate and unforeseen. Something that's making you question everything.
Sheldon: I'm so smart.