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The Bite of '87 was an event that occurred in the year 1987 at the fictional restaurant Freddy Fazbear's Pizza in the 2014 horror videogame Five Nights at Freddy's. It is briefly mentioned by the Phone Guy in the first game. The details of the attack and what animatronic responsible for it were originally unknown, but it allegedly caused the loss of the frontal lobe of the victim's brain.
When Five Nights at Freddy's 4 was released in 2015 it was seemingly revealed that Fredbear was the culprit of the Bite. In one of the minigames for the fourth game, the Protagonist's brother and his friends placed him into Fredbear's jaws as a prank, and the animatronic shut its mouth on the helpless child's head. However, it was revealed that this incident was a separate incident known as "The Bite of '83", as confirmed by Scott Cawthon on a Reddit post when discussing Game Theorist's final FNaF theory.
It could be possible that Foxy the Pirate caused the bite. This is because Foxy's attraction, Pirate Cove is shut down and Foxy's lower jaw apears to be broken along with him having sharp teeth. However, the second game rules Foxy out as the attacker because he was locked away with the other old animatronics in the Parts/Service room.
It could be possible that Freddy Fazbear himself caused the bite due to him having hand prints on his head, as if the victim tried to push Freddy back while he/she was getting bit. But Freddy, along with Foxy and the other old animatronics were locked in the Parts/Service room. It is therefore theorized that Freddy got the handprints because he was responsible for killing Phone Guy, and the handprints came from him while he was trying to fend Freddy off. Further proof is that Phone Guy recorded the messages he sent in the first game a week ago, and since Freddy has the handprints on his face from the beginning, it is possible that Freddy killed the Phone Guy the week before Mike Schmidt, the security guard in FNAF 1, started his shift.