I worked as a software dev, I had an intern to supervise. Everything was going well until he somehow got behind my back, tried some stuff on his own, and wiped out the whole database. Luckily we had backups, but I had to scramble to get it back and running as fast and possible, as I received dozens of calls or complaints almost instantly. For some reason, I was not allowed to modify permissions and accounts, and both me and the intern had superadmin privileges.