Ever since I was little and living at home with my parents I, my sister and brother have always seen a drip coming from the left corner of door ways. I have at times been so convinced that I have had to touch the ceiling to make sure there wasn't a leak. (the ceiling and the surrounding area are always bone dry). I still see the drip fro time to time now in my own home and my brother and sister still see it in there own homes. What is it?
