If you watch a lot of horror movies, you could easily believe that the biggest maintenance problem faced by owners of old houses is cleaning up the blood that drips from the ceiling during every thunderstorm and dinner party.  Even in an old black and white movie, it looks messy, nasty, and frankly just a little bit scary.   But it’s really nothing unusual, as columnist Dave Barry noted. “With these older homes,” Barry wrote in 2003, “you’re going to have a certain amount of ceiling blood.”