Trepanning Ritual? WTF are you even talking about?

According to Wikipedia, "Trepanning: In ancient times, holes were drilled into a person who was behaving in what was considered an abnormal way to let out what people believed were evil spirits.[3] Evidence of trepanation has been found in prehistoric human remains from Neolithic times onward."

Did you attend an AA meeting where they drilled holes in someone's head? I have never heard of that before but there is the whole group-autonomy thing.