My most recent one ... my brand new PC, only about 4 months old and finally at a point where I have everything installed, set, where I want it and happy ....
.... and the primary 2 TB SSD with the OS on it just drops dead.
Booted perfectly fine the day before. Wake up, move over to my desk to power on to watch YT or something during breakfast ... OS missing. Like, what?
Go into the BIOS and the SATA drive was just gone.
And I hadn't run my file backup in a couple months. I was going to do it the upcoming weekend. :|