: Ted spends the episode interacting with "future" versions of himself and Barney who argue over the potential outcomes of the night. Meanwhile, Marshall and Robin debate over who invented a cocktail called "The Minnesota Tidal Wave".
The episode concludes with an a cappella performance of Billy Joel's "The Longest Time" by Ted, Barney, and their multiple imaginary future selves. [S8E20] The Time Travelers
: Barney eventually snaps Ted back to reality, pointing out that everyone else—Lily, Marshall, Barney, and Robin—is busy with their own lives. Barney is planning his wedding, and the others are at home with their families. Ted is sitting alone at the bar with two tickets to a show he will ultimately attend by himself. : Ted spends the episode interacting with "future"