John Doyle has a real-life ability to control his eyes like a chameleon that will literally make your eyes pop out in amazement. Thomas Blackthorne claims he can insert a jackhammer down his throat… and then turn it on. Stevie Star claims he can swal... (more)low shocking objects, and regurgitate them in any order he chooses. How he does it, it's hard to say, but it's impossible not to watch. Ryan Stock puts a meat hook through his skull and attempts to pull weights that will push human bone strength to the limit.