Howard Wolowitz: Wait, so after all this time, that's your problem with engineering?
Adult Sheldon: Evidently.
Howard Wolowitz: So all the teasing and all the abuse had nothing to do with me?
Adult Sheldon: I'll admit, at first, I had a chip on my shoulder because of that class, but then it was mostly you.
Howard Wolowitz: Unbelievable. When will I learn?
Adult Sheldon: I could give you that answer, but if you figure it out for yourself, it'll mean so much more.
Howard Wolowitz: Goodbye, Sheldon.
Adult Sheldon: Bye.

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?

Adult Sheldon: Engineering has a rich and storied history, dating back to ancient times. Some consider it the single most important field of study... Okay, w-wha... no. Stop. I'm sorry. Howard, I can't do this.
Howard Wolowitz: You asked me to write you an introduction to engineering.
Adult Sheldon: Yes, and if I wanted a comedy routine, I'd have gone to Billy Crystal.
Howard Wolowitz: Just let me read it. [clears throat] Engineering has a rich and storied history dating back to ancient times. Some consider it the single most important field of study known to man, from the wheel to the International Space Station, which I went to.
Adult Sheldon: Honestly, this again?
Howard Wolowitz: Like we don't hear about your Nobel Prize all the time.
Adult Sheldon: It's not my fault people ask about it.
Howard Wolowitz: Because you're always wearing it! You have it on right now.
Adult Sheldon: Look how shiny it is.
Howard Wolowitz: [sighs] Just tell your story.

June: I got to admit, I'm a little jealous.
Meemaw: Of what?
June: You.
Meemaw: Why?
June: You have the Dale I never got. I spent a lot of time polishing that turd, and you get all the benefits.
Meemaw: Hey, I put my time in on that, too.
June: Not as much as me.
Meemaw: When I met him, he was a mess.
June: [laughs] You should've seen where I started.
Meemaw: Well, I think we can both agree, he is one lucky turd.
June: Amen, sister.

Professor Boucher: For your design assignment, you may decide between suspension bridges, truss bridges, beam bridges, just not Beau Bridges. [silence] And people say engineers don't have a sense of humor. [Sheldon raises his hand] Yes?
Sheldon: What are Beau Bridges?
Professor Boucher: That's all for today.