Well considering my computer does that I wouldn't feel scared at all
'my computer does it and I know about it; the fact someone else might not means they're handicapped!!!!'
Please be quiet.
My dad used to work as a computer technician for Motorola/Freescale in the late 90's - late 2000's, and apparently their entire system was a mess. All the computers were connected in a giant 'share' system, and you could view anyone's files unless they password protected it themselves - 1 out of every 5 workers there did, so basically anyone could view pretty much anyone else's stuff. At one point there was also a system migration done when they changed web servers from Motorola to Freescale in 2004, and whoever did it didn't bother deleting the old things on there - my dad used to dig through the files and found folders and files made by people who left years before and suchlike, untouched; the old webserver files and frame still existed, just unused.
Slightly different subject, similar problems: My dad also had trouble because he wasn't mainly working on computers, he was working on parts - specifically, the ones Motorola/Freescale made, to test them and fix whatever might be wrong. He used to tell stories about how he'd get processing chips back that had been used where he'd run through the diagnostic and the chips would set on fire because of how it was set up, or it would give an Error Code 0 (Power was put in, the chip didn't do anything in response - it's fried to bits), etc.
I don't know how the people who made those chips/The people that used them managed to screw them up that badly.