Watch How I Met Your Mother Season 3 Episode 9 - Slapsgiving

Episode: 3×09 (Season 3 Episode 09)
Name: Slapsgiving
Originally Aired: Nov. 19, 2007

Plot: Lily and Marshall have their first Thanksgiving as a married couple; Barney is tortured by the slap bet countdown clock, worrying about when the slap will be dished out.