Follow PhineasFan11 on Twitter: Add PhineasFan11 on Google+: .'s Goin' Down is a song sung by the villains in . in the upcoming special "Phineas and Ferb Save Summer" as they capture . agents, ultimately weakening the organization. The song is a parody of a number of different songs heard in the film/musical West Side Story, including "The Jets Song" and "Cool".