Reminds me of many years ago when a young engineer I worked with realised he could fiddle around with the file system on VAX/VMS and created a recursive definition which he thoughtfully called "pandora/box", under which was a folder "pandora", which pointed to - you guessed it, the parent folder. He gleefully demonstrated the recursion and showed pandora/box/pandora/box/pandora/box/pandora/box... etc. However, he was red-faced the next morning when the backup had failed as it had gone into a black hole down the recursion. Not only red-faced but severely reprimanded. However, he ended up with a job in the IT department, probably so they could keep him on a short leash!