Depressed fracture of the skull

On 3 June 1991, William was admitted to Royal Berkshire Hospital after being accidentally hit on the forehead by a fellow student wielding a golf club. He suffered a depressed fracture of the skull and was operated on at Great Ormond Street Hospital, resulting in a permanent scar. In a 2009 interview, he dubbed this scar a "Harry Potter scar" and said, "I call it that because it glows sometimes and some people notice it—other times they don't notice it at all".