One of the biggest mysteries in the history of the Five Nights at Freddy's series is the Bite of '87, but the culprit just might be Toy Chica. Scott Cawthon has been tight-lipped about the incident ever since the series first started, and fans have been speculating about it for just as long. The animatronic that actually did it might never be known, but some are stronger candidates than others.
The Bite of '87 is only mentioned once, in a phone call by the «Phone Guy» in the original Five Nights at Freddy'sgame. He states that this incident is why the animatronics no longer walk freely during the day, and that the victim survived the incident, albeit with severe damage and/or destruction of their frontal lobe. Details about it have come few and far between, and it's remained a mystery for the entirety of the FNAF series' existence. FNAF theories like Security Breach's Monty killing Bonnie are in no shortage, and every fan has their own opinion on who committed the Bite. A similar incident, the Bite of '83, was shown in FNAF 4, but there have been no references to '87 outside of the first game.
Related: How FNAF: Security Breach's Ending Sets Up A Sequel
Toy Chica is one possibility for the culprit of the Bite of '87. Due to the shape of her mouth and the fact that it's removable, the incident may have already occurred before FNAF 2 took place. Other animatronics are less likely, the Withereds especially so, so there's a small pool of candidates. The series' in-game history is long and twisting, and since it's never explicitly stated that the Bite occurred before or after FNAF 2, it's entirely possible that it had already happened by the time Jeremy Fitzgerald started working at Freddy Fazbear's. FNAF is a popular horror
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