Anger's ugly head

I was picking up another hedgehog tonight and came home to this little calling card. It turns out one of our neighbours was trying to get the attention of the neighbour the other side of us and thought they were banging on their window.
When confronted they admitted they banged on the window but we didn't see her break it.
A call to the local constabulary was made and they will be getting a visit in the next few days.