How I Met Your Mother
How I Met Your Mother

How I Met Your Mother (2005 – 2014)

2005 • 9 seasons • Comedy • TV-14
▲ +3 #184
8.3/10 785,083
81% 5,863
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On August 10, 2026
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Episode 21 — The Three Days Rule

Season 4 • How I Met Your Mother
Released: 2009-04-27 • Comedy
81%
User score
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.

Where to Stream Episode 21

Season 4 · Episode 21 · Streaming in USA
by JustWatch
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Episodes

Information

Episode air date27.04.2009
Episode runtime23 min
Episode rating8.06
GenresComedy
TMDB series rating8.1
IMDb series rating8.3
Series statusEnded
Age rating14+
CountryUS

Trailer

Cast

Josh Radnor
Josh Radnor
Ted Mosby
Neil Patrick Harris
Neil Patrick Harris
Barney Stinson
Jason Segel
Jason Segel
Marshall Eriksen
Alyson Hannigan
Alyson Hannigan
Lily Aldrin
Cobie Smulders
Cobie Smulders
Robin Scherbatsky
Cristin Milioti
Cristin Milioti
Tracy McConnell

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