I accidentally untarred archive intended to be extracted in root directory, which among others included some files for /etc directory.
I went on to rm -rv ~/etc, but I quickly typed rm -rv /etc instead, and hit enter, while using a root account.
Half a year ago I accidentally git cloned to a folder named ~, so naturally I did
rm -rf ~.Mistakes were made. Fortunately I backup my ~ so it was just annoying.