Voice of the Masses: What was your biggest Linux mistake?

Ever typed rm -rf / on a production server? Or extracted a tarball in the wrong place and overwritten some critical files? For our next podcast recording, we want to hear about your biggest Linux mistakes. It could be a dodgy command that you entered, or something you did to hose your X Window System setup and make your machine unusable. Let us know in the comments below and we’ll read out the best!