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  • The slap bet is one of the best long-running gags on HIMYM. 1 / 9

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  • It stemmed from the Robin Sparkles secret. 2 / 9

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  • Marshall was allowed to slap Barney 5 times for winning the bet. 3 / 9

  • He carried out the slaps throughout the season. 4 / 9

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  • Marshall also invented Slapsgiving. 5 / 9

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  • Lily, the slap bet commissioner, awarded Marshall three more slaps. 6 / 9

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  • It brought Barney's total to 8 slaps. 7 / 9

  • The last one came during Barney and Robin's wedding. 8 / 9

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