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Robin has a secret the entire gang tries to figure out, while Barney and Marshall enter into a slap bet regarding Robin's secret.
Robin hates malls. Everyone wants to know why but she isn't saying. Barney slap bets Marshall that she used to do porn. Marshall thinks she was married before. Lily is named slap bet commissioner and is tasked with overseeing any and all slaps. Ted tries to find out why she hates malls and everyone is shocked when they discover discover her secret.