Fat is a song that parodies Michael Jackson's song, Bad, which comes from the 1988 album Bad. The song is written by and sang by "Weird Al" Yankovic. This song is also the second parody track he did on Michael's, the first being Eat It, which is a parody song of Beat It. The music video for the song earned a Weird All a grammy for "Best Concept Music Video" in 1988.
The music video essentially parodies various parts of the Bad music video. Also with kind permission of Michael, Weird Al was able to use the actual subway set seen in Bad, for his parody video Fat.