[He does know the rest, and knows that uncomfortable face pretty well. But the explanation does clear up one other thing.]

And that's why you guys didn't want us doing the Pines Twins Switcheroo around here.

[That loops them back around to the uncomfortable elephant in the room. Stan doesn't exactly look happy, but he's not flipping out quite as much as when he first came in the room either, so that's something. He decides to just rip this band-aid off now.]

So...you gonna tell me how you wound up dating the guy who almost murdered the kids and literally turned you to stone or what?