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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Episode Details: How I Met Your Mother Season 4 Episode 21
| Title | The Three Days Rule |
| Episode | 21 |
| Season | 4 |
| Release | April 27, 2009 |
| Overview | 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. |
| Rating | 7.7 |
| Vote Count | 22 |
