Marshall: I said this is going to be the best Thanksgiving ever. Lily, you're the slap bet commissioner, is that allowed? Barney: Exactly. The slap-petizers. That means we're in the final hour of the countdown. Our first one as a married couple, as grownups and you're not even trying to be a part of it!
Plan: A: Thanksgiving; Q: What holiday do Lily and Marshall host as a married couple? A: Barney; Q: Who is tortured by the ticking of the slap bet countdown clock? A: the slap bet countdown clock; Q: What tick-tock tortures Barney? Summary: As Lily and Marshall host their first Thanksgiving as a married couple, Barney is tortured by the tick-tock of the slap bet countdown clock and the uncertainty of the exact moment the slap is going to be delivered.