How I Met Your Mother is beloved to this day for its ongoing gags, like the Lemon Law and Robin Sparkles. However, one of the most iconic inside jokes from the CBS comedy has to be the Slap Bet and Slapsgiving. This gag that spanned the course of eight seasons centered around a bet Barney and Marshall made in Season 2, and it spiraled into a maniacal plan Jason Segel’s character developed to torture Neil Patrick Harris’s character. With each slap, the plan got more detailed and outlandish, which in turn made it more extra and funny. However, the stories behind both the origins of the Slap Bet and its holiday Slapsgiving make the HIMYM joke even funnier.
