[s3e9] Slapsgiving -

After Barney taunts the group one too many times, Lily (the Slap Bet Commissioner) revokes her earlier "Thanksgiving truce." Marshall delivers a powerful slap that sends Barney across the room.

"How I Met Your Mother" Slapsgiving (TV Episode 2007) - IMDb [S3E9] Slapsgiving

Immediately after the slap, Marshall debuts his original song performing it on the piano for the group. Episode Details Original Air Date : November 19, 2007 Slap Number : 3 of 8 Director : Pamela Fryman Guest Stars : Orson Bean as Bob fandom.com/wiki/Slap_Bet">Slap Bet ? After Barney taunts the group one too many