Withered Foxy Jumpscare
Every second in the game, there's a 1 in 10,000 chance that you'll be suddenly scared by Withered Foxy from FNAF 2. This effect works absolutely everywhere, including game menus and interfaces.
An interesting feature: in a quarter of cases, Mangle appears instead of Withered Foxy, adding an element of surprise.
During the actual scare moment, which lasts about half a second, game control is completely blocked. However, in single-player mode, the game automatically pauses for the duration of the scare. If the game was already paused, it automatically resumes after the scare.
This modification was created under the influence of a similar mod for Terraria with a similar name.