At work, each employee has a home directory on a UNIX file system. The home directories are sorted into subdirectories, one per group within the organization. Recently I moved from one group to another and consequently needed my UNIX account moved to the new area.
Finally I was informed that the move had taken place. I logged in and discovered that instead of copying the contents of my old home directory to my new home directory, the copy started one level up. So inside my new home directory was actually a copy of the whole directory for my old group. Basically I had a copy of all the home directories of all the members of my old group right inside my new home directory. (On top of that, my old home directory was never removed from the old location.) Fortunately, among the many home directory copies I had was a copy of my own. I fixed the problem myself. Good thing I'm a scrupulous person.