How I Met Your Mother 4x21
The Three Days Rule
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.
How I Met Your Mother season 4
4x1Do I Know You?Sep 22, 2008
4x2The Best Burger in New YorkSep 29, 2008
4x3I Heart NJOct 06, 2008
4x4InterventionOct 13, 2008
4x5Shelter IslandOct 20, 2008
4x6Happily Ever AfterNov 03, 2008
4x7Not a Father's DayNov 10, 2008
4x8--Nov 17, 2008
4x9The Naked ManNov 24, 2008
4x10The FightDec 08, 2008
4x11Little MinnesotaDec 15, 2008
4x12BenefitsJan 12, 2009
4x13Three Days of SnowJan 19, 2009
4x14The PossimpibleFeb 02, 2009
4x15The StinsonsMar 02, 2009
4x16Sorry, BroMar 09, 2009
4x17The Front PorchMar 16, 2009
4x18Old King ClancyMar 23, 2009
4x19MurtaughMar 30, 2009
4x20Mosbius DesignsApr 13, 2009
4x21The Three Days RuleApr 27, 2009
4x22Right Place, Right TimeMay 04, 2009
4x23As Fast as She CanMay 11, 2009
4x24The LeapMay 18, 2009