Filmed on September 5, 2010 at the wedding of Lin-Manuel Miranda (the creator and composer of "In the Heights") and Vanessa Nadal. It was rehearsed in secret for a month. The only one in the wedding party who did not know what was coming was Vanessa.
Posted at YouTube on September 8, 2010, with 285,417 views as of September 13, and counting [Update: 716,341 as of September 16].
It may take a couple minutes to load — but after that it will be the best five minutes of your day.