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How I Met Your Mother: S4 E21
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.
S4 - E1Do I Know You? Sep. 22, 2008
S4 - E2The Best Burger in New York Sep. 29, 2008
S4 - E3I Heart NJ Oct. 06, 2008
S4 - E4Intervention Oct. 13, 2008
S4 - E5Shelter Island Oct. 20, 2008
S4 - E6Happily Ever After Nov. 03, 2008
S4 - E7Not a Father's Day Nov. 10, 2008
S4 - E8Woooo! Nov. 17, 2008
S4 - E9The Naked Man Nov. 24, 2008
S4 - E10The Fight Dec. 08, 2008
S4 - E11Little Minnesota Dec. 15, 2008
S4 - E12Benefits Jan. 12, 2009
S4 - E13Three Days of Snow Jan. 19, 2009
S4 - E14The Possimpible Feb. 02, 2009
S4 - E15The Stinsons Mar. 02, 2009
S4 - E16Sorry, Bro Mar. 09, 2009
S4 - E17The Front Porch Mar. 16, 2009
S4 - E18Old King Clancy Mar. 23, 2009
S4 - E19Murtaugh Mar. 30, 2009
S4 - E20Mosbius Designs Apr. 13, 2009
S4 - E21The Three Days Rule Apr. 27, 2009
S4 - E22Right Place, Right Time May. 04, 2009
S4 - E23As Fast as She Can May. 11, 2009
S4 - E24The Leap May. 18, 2009