Worst 40K moment

So, what is the worst thing that has happened to you in the world of Warhammer 40K? Mine happened tonight when I had my Ork Apocalypse army all lined up for muster so the Warboss will know what exactly he's got to go to war with. All my orks were hanging out having a pint of fungus beer or two while I was in the kitchen doing something and I hear my cat, who was busy looking over the orks trying to figure out which one to knock on the floor first, start to go hack....hack....hack....BARRRRRRFFFFFFFF!!!! All over my boyz. So much for going to sleep on time tonight.