The creepiest thing that happened to me was when my parents were out of town I was playing vault of glass in my living room when I heard knocking on a window behind me, I turn around and don't see anyone so I just ignore it. A couple minutes later I hear the same knocking on the same window. This happened a total of 2 or 3 times and keep in mind there were no trees near the window that could be hitting it. I'm a little freaked out but I just continue the raid. 5 minutes later my sister comes down from upstairs and asks me if I heard knocking on a window. I say "yeah on the window down here" she looked a little shocked because apparently she had heard knocking on her window upstairs but was too creeped out to look. She comes down and we start thinking about what to do. We end up building up enough confidence to check each window so we each grab big kitchen knives and slowly start checking every window. We checked them all except one in our little sisters room who we thought was sleeping but was just reading a book. (Now just imagine this, you are in your room just relaxing maybe watching some Netflix and you see your two older siblings slowly open your door with giant kitchen knives staring you at you. Yup that's exactly what it was like for her) We ask her if she heard the knocking and she said "yeah on her window" We had looked at all the windows and didn't find anyone. We all heard the sounds around the same time too. I have no idea what the knocking was, we never figured it out.