Slap Bet -

The Slap Bet was born in Season 2, Episode 9, titled "Slap Bet". The stakes were simple: Marshall bet that Robin was hiding a secret about being a porn star, while Barney bet she was hiding a secret marriage. The prize? One slap, as hard as possible, to the face of the loser.

Throughout the series, Marshall used his slaps to punctuate major life events and holiday traditions: HIMYM: 8 simple rules - What's Alan Watching? Slap Bet

The Legendary Slap Bet: A Guide to the Ultimate Sitcom Stakes The Slap Bet was born in Season 2,

If you’re a fan of How I Met Your Mother , you know that some bets are about money, some are about pride, and one—the —is about the pure, unadulterated terror of an impending open-palmed strike. What started as a simple wager between Marshall Eriksen and Barney Stinson evolved into one of the most iconic and longest-running gags in television history. One slap, as hard as possible, to the face of the loser