PITA bugs part 1

In my years working as a programmer, I have run into many, many bugs and introduced many of my own. A few stand out as tremendously irritating to debug, as their behavior made little sense and the source of the bug was non-obvious. The first issue was from my work for the HTCondor Project, an open source cluster management software used by research groups around the world including those working on crunching data from the Large Hadron Collider, the LIGO graviton detector, and the IceCube neutrino observatory.