I spent several months working on an RC racing game with a programmer named Ed "Fast Eddie" Ringler. When he left the company I was asked to step up and finish the game. Unfortunately, there was a pirated ML monitor (or a hex editor or something... can't remember) in with all the game files and I stupidly left it on the disk when we sent the game out for manufacturing. To make matters even worse, it was the FIRST file on the disk, so when gamers typed: Load "*",8,1 instead of my game, they got the illegally copied tool (which had lovely pirate messages all over the title screen).
We had to recall about 10,000 disks, which was a lot back in those days. Fortunately, I didn't get fired but I suspect my boss thought about it.