Not specifically a Gary/Linda moment but in much the same spirit: All the stuff having to do with MortalHubby from episode 106.
"MortalHusband is the worst superhero"
"His only weakness is everything"
"You can fool him by having fake cheesecake that's actually yogurt in the fridge"
"This tastes different...BWUUUH! There's no cream cheese in this!"
"Well, bring 'im over! I wanna meet this God-Husband."
"There's only one thing I know for sure about MortalHusband right now, and that's that he's SUPER GOOD at Mario Kart"
"Hey, you got another controller?"
"Why would I need one?"
"You can try to do a time-trial against me, but you'll lose."
"So, that's my dead grandma. That's my cat, that's my cat, that's my cat, that's my cat, that's my cat, that's my cat, and that's Loki!"
"...Who's also my cat"
"Also, this is MH"
"Yeah, the sad one. It's the sad one. He's upstairs playing Mario Kart right now."
"I like that part, where she said last time she was in a coven that the circles were at her place. I just imagine, like, the husband treating it like...y'know, like, I live with my girlfriend, and so 'Is tonight the witch-night? Okay, well, I'll make myself-"
"You're gonna want to make yourself scarce, Uh, I don't know if you've got stuff to do or you can hang out with the guys..."
"Oh, I've got some Mario kart I can play!"