Relation to the Bite of '87
It is unclear who caused The Bite of '87. Many currently speculate that Foxy is responsible for The Bite of '87 (with his sharp teeth and seemingly broken and snapping jaw). Although, in FNAF2 (which is implied to have taken place before the incident), he is hidden away in the Parts/Service room.
Some also believe that The Mangle, from the second game, may have been the culprit, as it swings downwards and bites where the frontal lobe is located.
Others believe that it was caused by Freddy due to the handprints that he has on his face, which is used as evidence by the people incriminating Freddy by stating that the victim tried to break free, thus attempting to push him away and leaving handprints. In support of this theory, the Rules for Safety poster usually located in the East Hall Corner states in rule 6: Don't touch Freddy; specifically calling out Freddy may imply that he may have been guilty.
The bite of '87
"It's amazing that the human body can live without the frontal lobe, you know?"- Phone Guy
The Bite of '87 was an incident that occurred in 1987 at Freddy Fazbear's Pizza; it is briefly mentioned by the Phone Guy in Five Nights at Freddy's, "...they used to be allowed to walk around during the day. But then there was The Bite of '87." The details of this attack (and the identity of the animatronic responsible) are not given, but it allegedly caused the loss of the frontal lobe of the victim's brain.
The incident cost the restaurant its reputation, which resulted in a drop in business. But the restaurant would have closed down either way because of the conditions of the restaurant and the many health violations. Five Nights at Freddy's 2 suggests that the attack occurs during the day after the game's Night 6 (when Jeremy Fitzgerald is asked to work the day shift and to stay close to the animatronics).
As a result of the incident, the animatronics were no longer allowed to wander around the building during the day; the management decided to limit their free-roaming mode to night-only as to prevent their servos from locking up.
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