Tell me more about house you live in @Nick
I don’t know about park @TouristGuide1 but I’ve seen gloomy cloud shadow 
it was from few days after of my grandfather death, I was laying on bed with blanket on me next to my mother, suddenly I heard voice of cat fighting and when I look on the floor with curiosity in my mind, right then I saw gloomy cloud with that voice enters into room and walks on the wall and disappear in between in less than 3 second almost, I was so scared so I hugged my mother and fall asleep 