Adult Sheldon: I had suffered some setbacks. But just as Edison had forged ahead on electric lighting without the help of Tesla, I was going to make it through orientation without the help of my mommy, even if she did make boo-boos stop hurting. While I had found inspiration courtesy of Thomas Edison, it was soon replaced with anger at Whitcomb L. Judson, inventor of the zipper.
Sheldon: [scoffs] Oh, come 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.

Pastor Jeff: Before our final prayer, would anyone else like to say a few words?
Mary: Missy? [Missy shakes her head] Shelly?
[Sheldon stands up and walks up to the microphone]
Sheldon: I've been thinking a lot about the last moments I had with my dad. It was morning, and he was leaving for work. He said, "See y'all later." And I said nothing. I regret that. I could have said "bye" or asked him for a ride. Or told him that I loved him. But I didn't. I barely noticed he left. So many times that I didn't notice my father. I hope he knew how much I loved him.
Adult Sheldon: I wish I could tell you I said all those things. But I didn't.
Mary: Shelly? [Sheldon shakes his head] [Mary shakes her head to Pastor Jeff]
Pastor Jeff: Let's bow our heads in prayer.
All: Our Father, who is in heaven, hallowed be Your name...
Adult Sheldon: For a long time, I focused on my father's shortcomings. Now that I'm his age and have kids of my own, I realize he was just a person doing the best he could, and he did a lot. I didn't say it at his funeral, but I can say it now. I loved my father. I will miss him forever.

Billy Sparks: Who's Melissa?
Missy: Me.
Billy Sparks: Then who's Missy?
Missy: "Missy" is short for "Melissa." Like how "Billy" is short for "William."
Billy Sparks: I don't understand.
Missy: You know how your real name is William?
Billy Sparks: I'm Billy.
Sheldon: No, we call you Billy, but your real name is William.
Billy Sparks: But my underpants say "Billy" in them. Mom, is my name William?
Brenda Sparks: [sighs] Yeah.
Billy Sparks: Then whose underpants am I wearing?

Sheldon: I'm excited to finally use college-ruled paper and not feel like I'm living a lie.
Billy Sparks: What's college-ruled paper?
Sheldon: The lines are 18% closer together.
Billy Sparks: College sounds hard.
Brenda Sparks: You won't have to worry about that, honey.
Billy Sparks: Okay.

Dr. John Sturgis: [on answer machine] Hello, Coopers. Dr. Sturgis here. This is a message for Mary. I have some news I need to share with you before Sheldon starts college. Please call me back. [answering machine beeps]
Sheldon: I wonder why he'd want to talk to you and not me.
Dr. John Sturgis: [answering machine beeps] Dr. Sturgis again. If Sheldon happened to hear that last message and is wondering why I'd want to speak to his mother first and not him... Excellent question! It's that kind of curiosity that makes him a true man of science. [answering machine clicks, beeps]
Sheldon: I'm a true man of science.