My mother used to say, "I need that like I need a hole in the head."
Trepan (v) - Surgery to drill a hole in your head. From the Greek trypan, to auger a hole.
Dating back to prehistory people have been drilling holes in heads. And, boy, was it common among cavemen. In one burial site in France dated to 6500 BCE, one-third of the 120 skulls showed trepanation surgery.
While there are a handful of legitimate medical reasons there are a whole lot of crackpots doing it. The ancient reason, to allow evil spirits to escape, is echoed by the claim that trepanation cures depression and allows spiritual enlightenment. There are even a few people who claim to have used electric drills to bore holes in their own heads.
It's body piercing gone berserk. Something less creepy next time, I promise.