the playstation 1 had some interesting but also creepy bugs/glitches when it came to loading discs. they were named fearful harmony & personified fear. the source of the names are something i don't know, but they are a tad bit fitting.
fearful harmony, the first sort of variant, occurs usually when an improper disc is inserted, like an ubuntu cd or a backup of a game you owned without using a modchip. this can also be done by severely loving up your BIOS.
instead of simply erroring out, it instead forgets up the sony computer entertainment logo, with different effects depending on the model and console used. the most important point, and what adds to the name fearful harmony, is that it will play overextended and delayed versions of the chimes you get while booting, in a ever so noticably increasing pitch.
it can be very creepy if you leave it on and don't know the effects of sound and other visual effects exist.
video footage with high quality audio here.another version with a very odd visual effect.personified fear is another glitch that can occur, typically with very scratched game discs or poorly burned backups.
contrasting to fearful harmony, its effect has no visuals, only fading to a grey/black screen when it occurs. audio wise, also contrasting, it does the playstation logo audio effect in a sudden, loud and quick sweep, fading away moments after.
this can make someone possibly a bit anxious depending on how scared they can be from things like this. the blackness and no audio might make someone confused and spooked, possibly waiting for a jumpscare (which obviously doesn't exist)
example, not much too it from anything elsebad le spooky furry animation that does not need to exist
i personally love old glitches like these, and sometimes just odd stuff in software. must be why i like the xbox hidden ambience stuff so much.