The FNAF Duck Song is a screamer parody of the infamous Duck Song using the Five Night's At Freddy's character Chica. It was uploaded to YouTube on August 29, 2014 by user WigWoo1.
The video has the normal song in the back, and the only differences are that Chica replaces the duck and it takes place in the security rooms in the game. As soon as "..running the stand" is sung, footage of Chica jumpscaring/killing the player appears along with the trademark scream of the first FNAF game, where it ends.
NOTE: The following video contains a screamer.