What was the most significant moment in the history of Barney and Robin's engagement on How I Met Your Mother?

How I Met Your Mother is one of the most beloved TV shows of all time, and the engagement of Barney and Robin was one of the most significant storylines in the show's history. While there were many memorable moments throughout the engagement, the most significant one was undoubtedly when Robin realized that Barney had proposed to her.

After a series of mishaps and misunderstandings, Barney had planned an elaborate proposal for Robin, which involved a fake news report that Robin was about to be deported. In the end, however, Robin saw through the ruse and refused to go through with the wedding.

It was only later, when Robin was watching a video that Barney had made for her, that she realized that Barney had actually proposed to her. The video showed Barney's journey to finding the perfect engagement ring, and ended with him holding up a sign that read, 'Will you marry me?'

This moment was significant not only because it was the culmination of Barney and Robin's love story, but also because it marked a turning point for both characters. Barney, who had always been a womanizer, finally found true love and committed to spending the rest of his life with Robin. And for Robin, who had always been afraid of commitment, the proposal was a sign that she was ready to take a chance on love.

The proposal scene has become one of the most iconic moments in How I Met Your Mother history, and is often cited as one of the show's best moments. It was a heartwarming and emotional scene that brought closure to the Barney and Robin storyline, and set the stage for the show's final season.