Adult Sheldon: Many cultures throughout the world relied on percussion to send messages across long distances. For example, the West African dundun was used to imitate human speech... [loud music playing] ...while I used my fist, the wall of my dorm, and Morse code to send a message.

Adult Sheldon: I didn't realize until years later that my father was only asking questions about lightning and thunder to cheer me up. In fact, he would often pretend to be dumb just to make me feel better.

Adult Sheldon: My father didn't always get the credit he deserved. The advice he gave me actually worked out pretty well. Of course, I never told him.
George: Talked to Billy.
Missy: Why would you do that?
George: No, it was good.
Missy: Stay out of my life.
Adult Sheldon: He may not have been the world's greatest dad. But maybe we weren't the world's greatest kids.

Adult Sheldon: Ignoring things that irritate me isn't my strong suit. Obsessively fixating on them, now that's what gets me out of bed in the morning.

Sheldon: What are you doing here?
Paige: Would you believe me if I told you I was working on a femtosecond laser in the engineering department?
Sheldon: Yes.
Paige: Then that.

Georgie: You know what else is nice?
George: Hmm?
Georgie: I get to learn from all your parenting mistakes.
George: I'm starting to think letting you live this long was one of 'em.
Georgie: Like that. I'd never say something so awful to my kid. [George scoffs] Thanks, big guy.

Paige: I'm messing with you. It's just, sometimes life sucks, and it's easier not to deal with it.
Sheldon: Could you be more specific?
Paige: Um... well, I have no friends, I don't fit in anywhere, and I dropped out of college but I'm too young to get a job, so killing brain cells makes it easier.
Sheldon: Huh.
Paige: Go ahead, smart guy, fix me. [Sheldon is silent] Mm.
Sheldon: Well, give me a minute.