Symphony of Illumination
episode of How I Met Your Mother (S7 E12)

"Symphony of Illumination" is the 12th episode of the seventh season of the CBS sitcom How I Met Your Mother, and the 148th episode overall. It aired on December 5, 2011. The episode is a continuation of the previous episode, "The Rebound Girl".
It is the second most critically acclaimed episode of the 7th season (behind "Tick Tick Tick"), and has been well reviewed by critics, especially for its ending.
Plot
Instead of Future Ted narrating to his kids as usual, this episode opens with Robin telling her two kids about the time she revealed to their father that she was pregnant. The scene cuts to Barney and Robin in the bathroom of Marshall and Lily's Long Island house, where Robin explains that she is a week late with her period, and has a doctor's appointment to find out if she is pregnant. She also reveals that she and Kevin have not yet had sex, meaning that if she is pregnant, Barney is the father. Although Barney is giddy at the prospect of becoming a father, Robin is still firmly against having children of her own. Barney comes to share her reservations when he sees how the life of an old friend, "Insane Duane", has changed since marrying and having children. Both Robin and Barney are relieved when the doctor informs them that Robin is not pregnant.
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