Dr. Linkletter: [answers phone] Hello.
Sheldon: Why did you never tell me there's 26 dimensions?
Dr. Linkletter: What?
Sheldon: I'm in Heidelberg and I'm studying string theory, and I'm now drastically behind, thanks to you.
Dr. Linkletter: Sheldon, it's 3:00 in the morning.
Sheldon: Oh, that explains why Dr. Sturgis didn't pick up.
Dr. Linkletter: That explains why I'm hanging up.
Sheldon: I had to be tutored by a child and the professor called me a dummkopf.
Dr. Linkletter: [chuckles] Now I'm glad you called.

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.

Professor Salzman: One should not even attempt to unify type-one und type-two...
Adult Sheldon: I wanted to give up and run away, but I had read enough comic books to know that heroes don't quit. Instead of running, I decided to stay and face the biggest challenge I've ever had: keeping my mouth shut.
Professor Salzman: Any thoughts on the compactification of the extra dimensions here?
[Sheldon goes to raise his hand along with Mei-Tung, but stops himself]
Adult Sheldon: Mmm.
Professor Salzman: Ja.
Mei-Tung: One must conserve the unbroken supercharges.
Professor Salzman: Und the spherical Hankel transform of this equation is... [Sheldon snaps his pencil]
Adult Sheldon: This turned out to be a pivotal moment in my life. By being open to people smarter than me, I grew as both a man and a scientist. Humble, brilliant... I really am the whole package.

Sheldon: Professor Salzman, I just wanted to let you know that I studied up and am now well-versed in the Calabi-Yau manifold.
Professor Salzman: Okay.
Sheldon: It was never part of the curriculum at East Texas Tech.
Professor Salzman: East Texas Tech? Sounds charming.
Sheldon: It's actually quite humid. Regardless, I'm ready to reassert myself as class leader.
Professor Salzman: Your classmates are from some of the most elite universities in the world. There is no East MIT.
Sheldon: Well, I would have gone to a better school, but I was 11, which you have to admit is pretty impressive.
Professor Salzman: Sheldon, at some point we ask of the piano-playing dog not, "Are you a dog?" but, "Are you any good at playing the piano?"
Sheldon: Excuse me?

Adult Sheldon: Heidelberg is considered one of the most beautiful cities in Germany. Heidelberg Palace, the Karl Theodor Bridge, the Schloss Schwetzingen. But I couldn't care less. The only sights I wanted to see were the looks of awe on the faces of my fellow students as I demonstrated my intellectual superiority.
Sheldon: Cylinders that are smaller than ten to the minus-35 meters. [all laugh] What's happening?
Professor Salzman: You don't laugh at people saying stupid things in Texas?
Sheldon: You're darn tootin' we do. So who goofed? [laughter]
Professor Salzman: You did, dummkopf.
Sheldon: Dummkopf? You're calling me a dummy?
Professor Salzman: Class, who knows where the dummkopf went wrong? [hands go up] Mr. Ziegler.
Mr. Ziegler: He forgot to consider the Calabi-Yau manifold.
Professor Salzman: Thank you, Mr. Ziegler.
Sheldon: Wait, what's the Calabi-Yau manifold? [laughter]
Professor Salzman: Dummkopf.
Adult Sheldon: I was quickly learning not all Germans were the warm, fun-loving people I was led to believe.