One of the double edged swords with any *NIX based operating system is that it will give you enough rope to hang yourself with. Without exception.
I was testing a new way of mirroring my data from some cloud storage that the company I work for has. One of the ways to do this is with rsync. After hammering out all of the fiddly details with how the host deals with the secure side of it, and ensuring that I could sync the copy the data properly, I started playing with the ability to delete the files off of the local drive.
And... yes, yes... deleteing? Oops.
It worked exactly as advertised. Fortunately I wasn't in a directory that had anything incredibly important that couldn't be replaced.
Ah the joys of learning new tools.