Dancing naked on the hillside time again...

One of the abiding memories of my childhood is watching 4 men struggle to put a straight jacket on the mother of a good friend of mine and then bundling her into a van which took her off to Herrison House - the local loony bin as it was known then. Her crime/problem? When it was full moon she used to dance naked on the hillside and 4 days later she would be returned home. It happened frequently. My father would threaten us with Herrison if we didn't toe the line...I still feel anguish when I pass by although it is now a rather up-market housing estate.