He obviously doesn't have pets or small children, or that wouldn't last two minutes. I didn't always keep the cover on my cases, but I do now, after my cat knocked over a full glass of soda onto my (thankfully) covered and running PC. I immediately shut it down, and even though it was covered, soda still managed to get inside the case, and onto my CD-RW and one of my hard drives. I carefully dried everything off, and it started back up again without any problems, but it gave me a big scare. If I wasn't in the room when the cat knocked over the glass, who know what would have happened.