Adult Sheldon: In physics, potential energy is a fascinating topic. Objects like springs store energy when they're coiled, waiting to unleash their full potential and soar to the heavens. Would you look at me go! Even in toy form, I'm shooting for the stars. While the potential energy of an object can be measured in absolutes, human potential remains more elusive. Sometimes, people seem to have all the potential in the world, but for some reason stay stuck to the ground.

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 Sr.: Talked to Billy.
Missy: Why would you do that?
George Sr.: 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: Visiting Tam's house for the first time was an emotional roller coaster.
For example, it's traditional in Vietnamese homes to have gruesome religious iconography near the entrance. I did not like that.
However, it's also customary to not wear shoes around the house for sanitary reasons. I did like that.
Interestingly, one of the main ingredients in Vietnamese cooking is an extremely pungent condiment known as fish sauce. I did not like that.
But before every meal, it's common for everyone to wash their hands and face. I did like that.
Forks are not customary in a Vietnamese household. I did not like that.
And instead of napkins, there was one towel for everyone to share at the table. Seriously, what are they thinking?

Sheldon: But why are you wasting your time here when you could be doing science?
Dr. John Sturgis: I told you, I'm happy here.
Sheldon: How could you be happy? You have a doctorate in physics, and you're sticking labels to a case of beans.
Dr. John Sturgis: I had to work here a month before they let me use this thing. And yet, I could go buy a real gun on my lunch break. Ha! Texas, huh?
Sheldon: But don't you miss trying to unlock the secrets of the universe?
Dr. John Sturgis: Sheldon, I spent my life chasing theoreticals. Here, I have tangible accomplishments and I get to listen to relaxing Top 40 music. Do you know this band, Air Supply? They're terrific. [sings] ♫ I'm all out of love ♫ ♫ I'm so lost without you ♫ ♫ I know you were right ♫ ♫ Believing... ♫

Dr. Linkletter: Well, I'm here to convince you to come back to the university. A mind like yours needs to be working on the advancement of science.
Dr. John Sturgis: Well, I did that for 50 years. Now I'm content just keeping these cucumbers crunchy.
Dr. Linkletter: But exciting new things are happening in string theory. Don't you want to be a part of that?
Dr. John Sturgis: Wasting years scrambling away at the academic hamster wheel? Constantly worried that your life's work is just one big dead end?
Dr. Linkletter: Sure, some paths of research may not pan out, but we still have to try, right?
Dr. John Sturgis: Do we?
Dr. Linkletter: Of course.
Dr. John Sturgis: I don't know. Einstein spent the last 30 years of his life on the grand unified field theory and got nowhere.
Dr. Linkletter: Well, I wouldn't say nowhere, but I suppose he never did crack it.
Dr. John Sturgis: And to this day, no one has.
Dr. Linkletter: True.
Dr. John Sturgis: In fact, most of his major accomplishments occurred when he was a young man, which you and I most certainly are not. [chuckles]
Dr. Linkletter: Sometimes I look in the mirror and I think, "Who is that?"
Dr. John Sturgis: Would you like to give these cucumbers a spritz?
Dr. Linkletter: No, thank you. Do you sell liquor here?

George Jr.: [o.s.] Did you like school?
Dale: Hated it. I quit and I joined the Army.
George Jr.: [o.s.] How was that?
Dale: Less girls, more getting shot at.
George Jr.: [enters] Well, at least you made it out alive.
Dale: Well, then I got married. Made me kind of miss getting shot at.
George Jr.: Have you ever been happy?
Dale: Ooh, let's see. No.