Raj: Hey, did you guys know this year's the 40th anniversary of Halloween?
Sheldon: Oh, nonsense. Halloween traditions of date back to the Celtic festival of Samhain. Although our current Halloween customs come from the evening before All Hallows' Day, All Hallows' Eve. Thus, Halloween.
Raj: I meant the movie Halloween.
Sheldon: Oh. Well, that's not interesting at all.
Leonard: Did you know the Michael Myers mask from the film was actually a Captain Kirk mask turned inside out?
Sheldon: Okay, now it's interesting.

Sheldon: Amy, do you think I'm always correcting other people?
Amy: No, not all the time. I mean, just last week, Penny ended a sentence with a preposition. You didn't even mention it.
Sheldon: True. I just waited until I got home and screamed into a pillow.

Amy: Is something bothering you?
Sheldon: Howard dressed up as me and imitated me, and everyone laughed.
Amy: Oh. Well, that must have felt terrible.
Sheldon: It did. I never realized my friends viewed me as an object of ridicule.
Amy: Oh, I don't think that's true.
Sheldon: They laughed, Amy. In a derisive way. Not in the instructive way I laugh at them when they're being stupid.

Howard: Hey, guys, I need your help. Bernadette's still pretty upset about your costumes.
Sheldon: She's upset? Those pants I wore to make fun of you were so tight, I risked a testicular hernia.

Sheldon: Leonard, you've been losing to me in three-dimensional chess for many years. You know what would be neat? If this was some sort of long con and one day you say, "Let's make this interesting," put money on it, and reveal that you actually know what you're doing. [Leonard makes his move] A very long con indeed. Checkmate.

Amy: You're up early.
Sheldon: Huh? Yes. I wanted to get a jump on planning a day of fun for you.
Amy: Oh, that's sweet. What are we doing?
Sheldon: Oh, no. Just you. I have other plans. Now, would you prefer to see The Grinch in 2-D or 3-D?
Amy: I don't want to see it at all.
Sheldon: Well, let's go 2-D. No sense in spending extra money.

Sheldon: And then you ask me 20 questions to try to determine which Nobel Prize-winning physicist I am. Ready? Go.
Mrs. Fowler: Can I give up?
Sheldon: No. 19 questions left. (ringtone playing)
Mrs. Fowler: Are you gonna get that?
Sheldon: Oh, no. We're in the middle of a game. 18 questions left.
Mrs. Fowler: Answer the phone, Sheldon.

Sheldon: [on the phone] Hello, Amy.
Amy: Hey, how's it going?
Sheldon: Well, Howard lured your dad away with magic, so now I'm bonding with your mom. [Mrs. Fowler stares at Sheldon] I think she likes me.

Mrs. Fowler: And Amy never joins us for Sunday dinners because you refuse to go out on a school night.
Sheldon: I can go out on a school night as long as I'm in my PJs by 10:00.

Mrs. Fowler: I can't believe it. All this time I've been angry at you when I should have been angry at Amy.
Sheldon: Look at that. We're both angry at Amy. Maybe that's something we could bond over. Let me ask you this: how do you feel about Howard?
Mrs. Fowler: Oh, is he that odd little friend you have with the haircut?
Sheldon: I may have married the wrong Fowler.

Mrs. Fowler: I don't know about you, but I don't really like magic.
Sheldon: You just keep getting better and better.

Sheldon: Oh, hey, Leonard. Is the podcast too loud
Leonard: I didn't hear a podcast.
Amy: I told you no one could hear it.
Sheldon: Well, I heard Ira Glass, so he's either in your earbuds or clinging to the ceiling like a gecko.

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!

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.