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How I Met Your Mother: The Three Days Rule / Season: 4 / Episode: 21 (2009)

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How I Met Your Mother: The Three Days Rule / Season: 4 / Episode: 21 (2009) (Television Episode)
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How I Met Your Mother

The Three Days Rule (Television Episode)

Season: 4
Episode: 21

April 27, 2009
 
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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. Although credited, Lily does not appear in this episode.