What skill do you develop to avoid the need for a helmet? Is it like a spidey sense, or do you hit yourself in the head so frequently your skull thickens enough to protect your brain from falling objects?

I would like to learn the skill to dodge harmful prolonged sound waves. A technique similar to the safety squint, but with your ears?

Don't mind me, boss. Just hitting my head off of this pipe to build up a resistance to physical trauma.