Ben Underwood taught himself to use echo location to navigate around the world. He is blind, both of his eyes were removed (cancer) when he was 3, but has managed to do some truly extraordinary feats. Basically hes Daredevil He can see the world throught sounds like a sonar or a dolphin.
Tim Cridland is an entertainer and a former member of the Jim Rose Circus. Tim specializes in sword swallowing, fire walking, sleeping on beds of nails (once even with a Toyota over him), body skewering and electrocuting himself. Tim says he can do this because he has mastered mind over matter. Researchers on the other hand say its because Tim was born with a mutation that makes it so he doesnt feel pain the way normal people do.
Its not that Tim and his ilk cant feel anything, because they can feel when they are touched, and they can feel temperature. They simply do not register pain thanks to malfunctioning receptors in the nerve cells that tell your brain.
The blind guy to me is the coolest. That's really amazing and to put it further anyone of us can achieve anything in life one we put our mind and soul into it.