Forgetting to write that WHERE statement, on a production database, during a serious case of Schroedinger's backup system, that failed.

....
oops

Haha, I remember wiping a client database in a similar fashion. Luckily we had a backup of everything that had been processed into the system, just not a backup of the database. I was at my desk until 3am reprocessing everything in chronological order.

@Sekhat and I was scouting every single third party warehouse doing an inventory check under false pretexts.