The song was originally performed by L'Homme Run, a comedic rap duo that featured Vampire Weekend vocalist Ezra Koenig.
[1] Koenig got the idea for the song from Noel Perrin's 1979 book titled Giving Up the Gun given to him by his father.
The video intercuts between members of Vampire Weekend performing at an indoor tennis tournament officiated by RZA and a female tennis player (Jenny Murray, the goth girl in the "Cape Cod Kwassa Kwassa" video) competing in the tournament.
As she plays her way through the competition, her opponents feature a handful of characters including Joe Jonas and Jake Gyllenhaal.
She ends the match with a return that causes the tennis ball to turn into a fireball and go right through her doppelgänger's racket, concluding the video by winning the tournament and pouring a bottle of milk over herself at the trophy ceremony.