How I Met Your Mother Season 4 Episode 21
Ted breaks one of Barney and Marshall’s relationship rules, texting a woman he recently met, so the pair play a joke on Ted by pretending to be the woman.
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TV-Show Info Page: How I Met Your Mother TV-Show Info
Episode Title: The Three Days Rule
Air Date: 2009-04-27
Season 4 Episodes List:
Episode 1 - Do I Know You?Episode 2 - The Best Burger in New YorkEpisode 3 - I Heart NJEpisode 4 - InterventionEpisode 5 - Shelter IslandEpisode 6 - Happily Ever AfterEpisode 7 - Not a Father's DayEpisode 8 - Woooo!Episode 9 - The Naked ManEpisode 10 - The FightEpisode 11 - Little MinnesotaEpisode 12 - BenefitsEpisode 13 - Three Days of SnowEpisode 14 - The PossimpibleEpisode 15 - The StinsonsEpisode 16 - Sorry, BroEpisode 17 - The Front PorchEpisode 18 - Old King ClancyEpisode 19 - MurtaughEpisode 20 - Mosbius DesignsEpisode 21 - The Three Days RuleEpisode 22 - Right Place, Right TimeEpisode 23 - As Fast as She CanEpisode 24 - The Leap