If you’ve ever been to a circus or a sideshow, you might have seen someone perform a trick known as the human blockhead. It’s the one where someone hammers a nail into his nostril. Some performers add extra flair by replacing the nail with other objects like spoons, corkscrews or hand-operated drills. Regardless of the pointed implement used, the trick usually gets a strong reaction from the crowd. It’s the kind of act that makes some people cringe and look away, while others watch in fascinated horror.
