Meemaw: I want to teach you somethin'. Look at your cards, and then look in the mirror.
Sheldon Cooper: Hey, I'm smiling.
Meemaw: Uh-huh. And what does that tell me about your cards?
Sheldon Cooper: That I like them?
Meemaw: Attaboy. Now... look at my face. Tell me what you see.
Sheldon Cooper: That you're old.
Meemaw: It's a good thing I love you.
Tam: Are you into rocketry?
Sheldon Cooper: I started with water propulsion, worked my way up to solid fuel, then went back to water after I set our garage on fire.
Sheldon Cooper: I also tried to get some uranium and build an atomic engine, but that stuff's hard to find.
Tam: Probably for the best.