Knife stabbed to a skull

Do you ever know that the largest object ever to be removed from the human skull was a survival knife ? It was big with 20.32 cm (8 inch). The Individual who survived was a 41 year-old Michael Hill. Michael answered the door to his friend's place and had a knife plunged into his skull. He then walked down the street to another friend's house. Four hours later the knife was removed. Michael didn't even have an infection and was well enough to leave the hospital a week later. Since his close brush with death, Michael's memory isn't the same and he needs medication to prevent seizures.