One of those moments when you looked down, and knew that something HAD to be wrong? Then you look over everything, try to figure out what it could be, and finally come to an acceptance of the situation?
I measured the output of one of my LM7805s today, and had one of those moments, what I saw just couldn't be right. I spent about five minutes measuring other known voltages, cycling the power supply, and everything else I could think of before I could accept it.