Adult Sheldon: In an effort to find out the mistake in his experimental design, Dr. Linkletter performed his own experiment on me.
[title: "Reverse Psychology"]
Dr. Linkletter: You know, Sheldon, I don't even care if you tell me the error. In fact, I'd rather you keep it to yourself.
Sheldon: All right.
Dr. Linkletter: [quietly] Yeah.
[title: "Bribery"]
Dr. Linkletter: I got you a little something for all your hard work. It's about a little boy who doesn't let being dead stop him from having fun.
Sheldon: Thanks.
Dr. Linkletter: [chuckles] Now that I've given you something, perhaps you want to reciprocate.
Sheldon: Sure. You can have this. I don't want it.
[title: "Disorientation", George Sr. is woken up by a phone call in the middle of the night]
George: [answers phone] Hello?
Dr. Linkletter: Uh, may I speak with Sheldon?
George: It's the middle of the night. Who the hell is this?
Dr. Linkletter: Uh, wrong number. [dial tone]

Sheldon: Dr. Linkletter, I need to talk to you.
Dr. Linkletter: Are we in my office?
Sheldon: No.
Dr. Linkletter: Then these are not my office hours.
Sheldon: Are you using my love of schedules against me?
Dr. Linkletter: [chuckles] Oh, yes.
Sheldon: Well done.

Dr. Linkletter: Sheldon, thank you for coming in. I want to apologize for our little tiff earlier.
Sheldon: You're forgiven.
Dr. Linkletter: Oh. Great. I found something that might be of interest to you. An authentic signature from Richard Feynman.
Sheldon: Where did you get this?
Dr. Linkletter: Details aren't important.
Sheldon: Is this a restraining order?
Dr. Linkletter: Not important.
Sheldon: That's actually a really good way to get autographs. I'll have to keep that in mind.

Jim: Here we are. Grab a shovel and dig in. There you go.
Dr. Linkletter: I spent the summer in Italy once.
Georgie: Bringing back memories?
Dr. Linkletter: No.

Georgie: What is this?
Meemaw: That's the exercise guy Meemaw likes.
Georgie: I can't believe anyone pays money to watch old people sweat.
Missy: 40 bucks?
Georgie: They sold over a million of those? At 40 bucks a pop? Do you know how much money that must be?
Missy: I'm not a calculator.
[later:]
Georgie: 40 times... one million. That's 40 million!
Missy: Whoa.

Adult Sheldon: Behind every great scientist, there were often unsung helpers toiling away in the background. Presenting... "Great Lab Assistants in Scientific History" When Alexander Graham Bell needed an assistant, it was Thomas Augustus Watson who answered the call. [laughs] Get it? "The call". [snickers] Madame Curie's daughter Irène was also her lab assistant. Irène was so dedicated, she died of radiation poisoning. Unlike her sister Ève, who selfishly lived to 102. Lastly, Émile Roux was assistant to Louis Pasteur. When they worked on the rabies vaccine, Roux kept a loaded gun in the lab to shoot Pasteur in the head if he got infected. He never had to, but it's fun to know he would have.
Dr. Linkletter: No, Sheldon. You can't be my lab assistant.
Sheldon: Maybe you weren't paying attention. I'll start over. Behind every great scientist, there was a dedicated as...

Adult Sheldon: While not the lab work I hoped to be doing, it did feel good to be part of an actual experiment. A tedious, menial part that could be performed by a monkey. Or worse, an engineer.