I’ve literally done rm -rf / while root. I thought I was elsewhere and did rm -rf . and I was in the top level directory. When it took way longer than I expected, I hit CTRL+C about 10 times and looked at the damage. Oops.
Luckily it didn’t get to /home, but it did wipe out /bin and /etc. I had to rebuild the OS. I learned.
Used to be me. I ran Debian Unstable for years. Got tired of it breaking. I installed Stable probably 7 or 8 years ago and never looked back.