Amy: Sheldon, it's the American way, the peaceful transfer of power.
Sheldon: I don't know.
Leonard: Think about Ant-Man.
Sheldon: I'm always thinking about Ant-Man.
Leonard: Michael Douglas had the suit and then he passed it on to Paul Rudd.
Sheldon: Maybe you're right.
Amy: Really? The Ant-Man thing? That's what won you over?
Sheldon: Yes. He got the details right. That's how you use a superhero.

Sheldon: I don't understand why you people are picking on my friend, Howard, when there are much more serious security threats to pursue. For instance, when I first met Leonard, he was on the verge of giving away rocket secrets to a North Korean spy, and not one agent ever investigated that.
Agent Page: This is Leonard Hofstadter?
Sheldon: No, it's a different Leonard. He's Chinese, red hair, six fingers. Good-bye.

Sheldon: Howard, the person at fault for you not getting a security clearance is me.
Howard: You?
Sheldon: Yes, but before you get upset, I want you to know I went to the FBI and retracted my statement.
Howard: And they were okay with that?
Sheldon: No. If anything, I made it worse.

Sheldon: Well, of course I'm worried about you, I want you to be safe.
Amy: And I want you to be safe.
Sheldon: I will be. I'll have my friends with me. If anything should go wrong, I can use them as human shields.

Doctor Wolcott: Well, let me show you around. This is the chair where I do most of my thinking, my thinking about work. Now, my thinking about people who have wronged me, I do over there.
Sheldon: I've always said that I should get a grudge chair. Leonard, have I not always said that?
Leonard: Mm, you have, but you were worried you'd spend too much time in it.
Sheldon: Yeah. That is a real concern.

Sheldon: Do you really know how to Riverdance?
Amy: You tell me.
Sheldon: I'm the only man you do that for.

Stuart: Oh, look at that. Neil Gaiman tweeted about my store!
Howard: What did he say? Uh, "Next time you're in Pasadena, check out The Comic Center. Great vibe, old school, the owner really knows his stuff." Isn't that amazing?
Sheldon: Well, uh, it's no Sandman, but I guess we can't expect everything he writes to be a masterpiece.

Sheldon: Can you see Mercury? Can you see it?
Raj: One second.
Amy: You know, the Greek version of Mercury, Hermes, was worshipped in Athens by the carving of giant wooden phalluses.
Sheldon: Please, Amy, get your mind out of the ancient Athenian gutter.

Sheldon: What am I supposed to do now if I want to hang out and read a comic book?
Stuart: Go sit on the couch.
Sheldon: Next to a stranger? If I'm going to sit, read, and ignore a woman, it's going to be my fiancée.

Penny: Hang on, I think the emergency key is around here somewhere.
Sheldon: We have a bowl. Our keys go in a bowl. You should get a bowl.
Penny: So, how did the beautiful mind of Sheldon Cooper forget his key in the first place.
Sheldon: I left them in the bowl.

Sheldon: I'll be right back. Feel free to play with yourself.

Leonard: Hey, did you ever make it to the dentist?
Sheldon: Not necessary. No. I found a service that'll send a van to your house for a teeth cleaning. Mostly they cater to dogs, but the fellow on the phone seemed to have an open mind.

Sheldon: Are you suggesting that you've come to your senses and wish to re-establish the mutual benefits that stem from full participation in the roommate agreement?
Leonard: Absolutely. If you admit that you're a 30-year-old man who's incapable of functioning on his own.
Raj: Ooh, Sock Mouth's got him on the ropes.
Sheldon: I will admit nothing of the sort. And now if you'll excuse me, I have to call my dentist and see if I can also get my hair shampooed and my nails clipped.

Sheldon: Power failure. Implementing power-failure protocol.
Leonard: What happened to all your glow-in-the-dark-emergency-exit stuff you had painted on the floor?
Sheldon: Oh, that was wildly carcinogenic. Anyway, it's too bad you’re no longer entitled to the full benefits of my friendship, because I happen to be extremely prepared for such an emergency. Please try not to see anything by this light. It's not for you.
Leonard: It's just a blackout, I'm sure the power will be back on soon.
Sheldon: And I'm sure some fool in the Donner party said the snow would stop any day now. I like to think they ate him first.

Sheldon: Excuse me, Leonard.
Leonard: Since when don’t you knock? It's like the only good thing about you.
Sheldon: Social niceties have been suspended, Leonard. We're in a state of a emergency. The world has descended into darkened turmoil. Lawlessness and savagery are the order of the day.