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How I Met Your Mother: 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.


9/10 (22 Votes cast)

Episode Info


Episode number: 4x21
Production Number: 4ALH21
Airdate: Monday April 27th, 2009

Director: Pamela Fryman
Writer: Greg Malins

Alternate Airdates:

UK (E4) May 06, 2010

Guest Stars
Main Cast
Josh RadnorJosh Radnor
As Ted Mosby
Jason SegelJason Segel
As Marshall Eriksen
Cobie SmuldersCobie Smulders
As Robin Scherbatsky
Neil Patrick HarrisNeil Patrick Harris
As Barney Stinson
Alyson HanniganAlyson Hannigan
As Lily Aldrin
Bob SagetBob Saget
voiced Narrator / Ted, 2030
Episode Notes
This is the first episode where one of the main cast members does not appear at all. Alyson Hannigan (Lily) is absent due to her real-life pregnancy.

Robin only wears baggy shirts and most of the time holds something (like dry cleaning or her bag) in front of her belly, because Cobie Smulders (who plays Robin) is pregnant in real life.



Episode References
Barney mentions Robin's first date with Ted, which we saw in the pilot episode.



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