Meemaw deflects: “I found a quarter in the parking lot.” Sheldon: “That’s not dubious. That’s lucky. But you’re lying.” Mary sends Sheldon to his room. Sheldon can’t let it go. He creates a “Probability of Deception” chart on his whiteboard, factoring in Meemaw’s increased heart rate (he counted her pulse at dinner), her refusal to eat the chimichanga (her favorite), and a faint smell of lottery scratch-off residue on her fingers.

Mary announces that Meemaw is coming over for dinner. She’s been acting secretive lately, and Mary suspects she’s hiding something “sinful.” Sheldon, ever literal, asks if she means actual sin (greed, envy, lust) or the colloquial “sinful” like eating an entire cake. Mary sighs. Meemaw (Connie) is on the phone, speaking in hushed tones. She’s just won $1,500 on a lottery ticket. She hangs up, grinning. But then her face falls — she realizes if Mary finds out, she’ll lecture her about gambling being a vice. Worse, if Sheldon finds out, he’ll calculate the statistical improbability of her win down to the tenth decimal and ruin her joy.

Sheldon: “But greed is one of the seven deadly sins.” George: “So is sloth, but you’ve been in that chair for four hours doing math problems instead of taking out the trash.” Sheldon: “…Touché.” Mary volunteers at a church bake sale. Meemaw shows up with a box of store-bought cookies (passing them off as homemade). Mary is suspicious. Meemaw gets defensive. A loud argument erupts in front of Pastor Jeff. Meemaw finally blurts out: “Fine! I won $1,500 on a scratch-off, and I’m not giving a dime to the church roof fund!”