Where To Stream How I Met Your Mother Season 4 Episode 21
The Three Days Rule
- Aired April 27, 2009
- 30 Min
- Rated 8.3
- Number 49 Of 208 Rated Episodes
When Ted breaks Barney and Marshall's "three days rule" by having a "text" relationship with a girl he just met, they play a cruel joke on him by pretending to be her.