The more technical term for this is a shunt - a device used to relieve pressure from the brain caused by brain fluids.
This would be near the top of my head - like a unicorn! It would also mean they would shave my head.
Barb (without a beat): I'll shave my head too!
Diane (without a beat): Sorry, not that good a friend.
Jamie (without a beat): I could switch teams!
Shortly thereafter I learn that no blowhole is needed.