The only thing is, things might not be quite as perfect as they had hoped.

As a result, Something Borrowed is a savvy and suitable entry as Season 2s penultimate episode.

Desperate for a place to stay, Lily begs Barney to let her crash at his.

Neil Patrick Harris as Barney Stinson in How I Met Your Mother

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The episode thrives on its novelty pairings (and aHIMYMcameo no one saw coming).

For many, it would have been the perfect point for the series to finish.

The episode sees both Barney and Robin suffering panic attacks just minutes before they are due to get married.

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As they process their heightened feelings, Marshall and Lily decide to revisit their own wedding vows.

With Lilys body changing through the stages of pregnancy, Barney develops an interest in seeing her breasts.

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Neil Patrick Harris and Britney Spears wearing matching blue sweaters on How I Met Your Mother

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Barney cuts in on Ted and Robin who are dancing together at an event in How I Met Your Mother.

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How I Met Your Mother Season 2 Episode 21 “Something Borrowed”

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How I Met Your Mother Season 2, Episode 5 “World’s Greatest Couple”

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How I Met Your Mother-3

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‘How I Met Your Mother’ Season 1, Episode 19 “Mary the Paralegal” (2007)

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Ted Mosby stands in the rain on the roof of his apartment complex crying up at the sky while Barney Stinson stands judging him in the background in ‘How I Met Your Mother’ Season 1, Episode 22 “Come On”.

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Barney and Robin stand facing each other at the altar, smiling at one another as they prepare to get married in ‘How I Met Your Mother’ Season 9, Episode 22 “The End of the Aisle”

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Robin, Lily, Marshall, Barney, and Ted sit around a table at a Japanese restaurant in ‘How I Met Your Mother’ Season 7, Episode 22 “Ducky Tie”.

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Barney Stinson bounces around with excitement as he competes on ‘The Price Is Right’ with Bob Barker in ‘How I Met Your Mother’ Season 2, Episode 20 “Showdown”.

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How I Met Your Mother