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.
| Title | The Three Days Rule |
|---|---|
| Genres | Comedy |
| Release Date | 2009-04-27 |
| Episode Runtime | 00 Hours 22 Minutes |
| Season Number | 4 |
| Episode Number | 21 |
| Production Companies | Carter Bays, 20th Century Fox Television |
