" They used to be allowed to walk around during the day too, but then there was the '' Bite Of 87 ." Yeah. I-It's amazing how the human body can live without the frontal lobe, you know? " - Phone Guy - Night 1
The Bite of '87 was an incident that occurred in 1987 at Freddy Fazbear's Pizza; it was briefly mentioned by the Phone Guy in the first game. The details of this attack (and the identity of the animatronic responsible) were not given, but it allegedly caused the loss of the frontal lobe of the victim's brain.
The incident contributed to a loss in the restaurant's reputation, which resulted in a major drop in business.
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 nighttime, so as to "prevent their servos from locking up," as stated by Phone Guy.
P.S. If you didn't, know it was called The Bite Of 87 because it happened in 1987.
