A childhood belief about i'm different

My sister and I shared a room and bed for most of my childhood. She was always scaring me by hiding under the bed. But, the worst was when she would tell me that a cow was looking in the window. I was absolutely terrified of this "cow" and would never look outside. I would make sure the curtains were tucked tightly around the window with no gaps. I would run outside in the morning to see if a cow had left any traces, but I, of course, never found any. I still don't like to look out of windows at night.