How I Met Your Mother Season 9 Episode 14
In an attempt to deliver a devastating final slap to Barney, Marshall explains how he mastered the Slap of A Million Exploding Suns.
Serie: How I Met Your Mother
Guest Star: April Bowlby, Eva Amurri Martino, Joe Nieves, Katie Walder, Nathan Morris, Nazanin Boniadi, Shawn Stockman, Stacy Keibler, Wanya Morris