The episode features Ted Mosby (Josh Radnor) as he wakes up hung over and attempts to piece together the events of the previous night.
At MacLaren's, Barney, Marshall, and Lily criticize Ted for overthinking every aspect of his life, rather than simply acting on a whim.
He wakes up the next morning with a girl he does not remember beside him in bed, a pineapple on his nightstand, a sprained ankle and his coat partially burnt.
Ted asks Marshall and Lily about the night and they tell him that he sang along with the jukebox in the bar while standing on a table.
After some more time spent at the bar, he put Ted back into bed, although similarly has no idea who the mystery girl is.
[2] In the clip, The Captain has a pineapple on his porch, and explains to the gang that he practices the tradition of putting one outside as a "symbol of hospitality".