When you were young, there was a place that scared you. It might have been a house, perhaps one in your neighborhood. More probably it was a room. I'll bet I can even describe the room for you. First and foremost, it had far too many windows.
Windows are scary things, unlike doors which are friends.
Anyone can break a window. And people peek into windows. They can watch you without permission. Throwing a window into a wall is a brave act. It says, I dare you to come through here.