Adult Sheldon: Before that disembodied voice on AOL started saying, "You've got mail," we relied on my mom.
Mary: Shelly, you've got mail!
Adult Sheldon: Some mail brought great joy.
Sheldon: Greetings, Mr. Spock.
Adult Sheldon: Some mail brought pain.
Mary: George, you got jury duty!
George Sr.: Tell 'em I died!
Adult Sheldon: And one time, mail caused a war between neighbors rivaling that of the Klingon Empire and the Federation, which trust me was a doozy.

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?

Brenda Sparks: What are you doing out here?
Billy Sparks: Playing with Sheldon.
Brenda Sparks: You're missing your party.
Billy Sparks: But I'm having fun.
Sheldon: Do not be alarmed, our mission is one of peace.
Brenda Sparks: I'm gonna go have a little chat with your mother.
Sheldon: Seems unlikely; my mother's on Vulcan.
Billy Sparks: My mom is on Valium.

Congregation: [singing] Heart of my Own heart
Billy Sparks: [singing] Old MacDonald Had a farm
Congregation: Still be my Vision O Ruler of all
Billy Sparks: E-I-E-I-O.

Dr. John Sturgis: So if Einstein's analysis of time is correct, the future's already happened, but we'll discuss that in more detail next week.
Sheldon: Or perhaps we already have.
Dr. John Sturgis: Exactly. [laughs]
Meemaw: Good one.