The Bite of 87 comes from Five Nights at Freddy's lore, first referenced in the original 2014 game when Phone Guy mentions an incident in 1987 in which a victim lost their frontal lobe but survived. The event itself is never shown on screen, which helped it become one of the franchise's most debated mysteries, fuelling fan theories, animations and lore videos for years. Creators now use the short sound as shorthand for that incident, instantly signalling a dark twist or a reference that longtime fans will recognise without any explanation.