Nicknamed 'The Human Anvil" and "Hammerhead" for his ability to have heavy objects (e.g., a concrete block; a pile of bricks) placed on his head which are then pounded by a sledge hammer or broken with a jackhammer.He is also known for driving spikes into wooden planks encased in metal with a head-butt. His skull was subject to an MRI at the Brigham and Woman's Hospital(Harvard Medical School)and found to be 2.3 times thicker then average human skull.