Mary: Are you ready for your surprise?
George: I sure am.
Mary: Okay. [German accent] Hello, you handsome American boy toy. I am Helga. Do you like what you see?
George: [German accent] Yeah. Yeah. Yeah. Yeah. [both laugh]
[Sheldon unlocks the front door and walks into the house]
Sheldon: Hello?
Mary: [o.s.] Are you sure your wife won't come home?
George: [o.s.] [laughs] I'm sure.
[Sheldon knocks on his parents' bedroom door and then opens it]
George: [o.s.] Yeah, yeah. [Mary laughs] Oh, Helga.
Adult Sheldon: I never talked to my father about what I saw that day, but, from then on, I added extra knocks so people could get their pants on.

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: Mark my words, string theory is going to be the next big thing.
Mary: What does it do?
Sheldon: It explains the fundamental forces of the universe. How everything works, where everything came from.
Mary: I know where it all came from. [points to the heavens]
Sheldon: Mother, we're in the sky. Why are you pointing up?

Pilot: [v.o.] Sorry for the delay. We hope to be wheels up in about 20 minutes.
Sheldon: That's what he said 20 minutes ago.
Mary: Nothing we can do.
Sheldon: If we don't take off soon, we'll miss our connecting flight to Houston.
Mary: It's out of our hands. I'd tell you whose hands it's in, but you don't like that.

[After a bout of turbulence, Mary clasps her hands together in prayer]
Sheldon: Oh, there's no reason to do that. It's just irregular motion of air around the plane caused by temperature changes. [more turbulence] Oh, that was a big one. And given our altitude, perfectly predictable. [cabin alert chimes]
Flight Attendant: [v.o.] The pilot has turned on the seatbelt sign. Please return to your seat.
Sheldon: A reasonable precaution. [checks seatbelt] Snug as a bug. [more turbulence]
Mary: Would you like me to include you in my prayers?
Sheldon: No, thanks, I don't need to seek help from an invisible man.
Mary: You're right, you've got your invisible strings.