How I Met Your Mother (2005)

S4E21 The Three Days Rule

Title: The Three-Day Rule Plot: Ted violates a crucial relationship guideline set by Barney and Marshall by reaching out to a girl he just met. In response, the duo decides to prank Ted by impersonating her through text messages, leading to a series of humorous misunderstandings. As they keep the ruse going, Ted becomes increasingly confused, unaware that his friends are behind the charade, resulting in unexpected revelations about dating dynamics and friendship.