That's One! - How I Met Your Mother first time Marshall slaps Barney - YouTube
Lemon Law: Barney Stinson´s legacy - Series & TV
Best Barney Slaps Marshall GIFs | Gfycat
How I Met Your Mother's Best Recurring Gags | POPSUGAR Entertainment
How I Met Your Mother" Slapsgiving 3: Slappointment in Slapmarra (TV Episode 2014) - IMDb
How I Met Your Mother Recap: Slappy Seconds
How I Met Your Mother Slapsgiving: An oral history | EW.com
How I Met Your Mother: Home for the Holidays - TV - Vulture
How I Met Your Mother" Slapsgiving 3: Slappointment in Slapmarra (TV Episode 2014) - IMDb
One of the funniest scenes imo is Slapsgiving when Marshall slaps Barney then sings about it and Barney does back up vocals whilst holding his slapped face : r/HIMYM
How come when Marshall prematurely slapped Barney without the permission of the Slap Bet Commissioner, Marshall was only slapped three times, and right there? That doesn't seem fair. I'm not trying to
How I Met Your Mother" Slapsgiving 3: Slappointment in Slapmarra (TV Episode 2014) - IMDb
Slap Bet | How I Met Your Mother Wiki | Fandom
Marshall slaps Barney Sixth and Fifth time - Barney & Marshall video - Fanpop
Why did Marshall Eriksen get to slap Barney 10 times while Barney got only 3 slaps for premature slapulation? - Quora