So I hung up Christmas lights on the outside of my house today and I swear I checked to see if they were working first.  In fact I even ran to the store to replace a string that had gone out.  But then when it got dark and I could see it in action there was another string that was out.  And of course it's on the highest, hardest to reach part of the house.  Dang it.  Gonna have to try to replace that tomorrow, I guess.