Brueghel the Elder's engraving The Witch of Mallegem.
A woman on the right throws her head back and stretches her entwined hands upward in a painting depicting this practice by Jan Sanders van Hemessen. A crowd of people wait to have this practice done to them in Pieter            Brueghel the Elder's engraving The Witch of Mallegem. A painting demonstrating this practice has an unexplained white gibbet in the background and a tonsured man in the center holding a jug and gesturing towards the main action, and includes an inscription saying "My name is castrated dachshund." A woman balancing a (*) book on her head watches a man wearing a funnel for a hat perform this action, which for some reason involves a tulip, in that painting. For 10 points, name this wacky surgical practice illustrated in Hieronymus Bosch's The Cure of Folly.
A woman on the right throws her head back and stretches her entwined hands upward in a painting depicting this practice by Jan Sanders van Hemessen.
removing stones of madness from the head [accept clear equivalents; accept trepanation or trephination or burr holing; prompt on answers like "curing madness"]