A sysadmin at one of my startups once mixed up c and x in a tar backup. Our source repository suddenly teleported back in time. We polled ourselves to see who'd

A sysadmin at one of my startups once mixed up c and x in a tar backup. Our source repository suddenly teleported back in time. We polled ourselves to see who'd updated most recently, and that guy's snapshot became commit #1 in the new repo. (Unfortunately this was the age of cvs, so the local copies were just source, not the history.)