The late Beatle George Harrison once punched and broke the nose of a 14-year-old female groupie, claims Jonathan King in his memoirs, 65 My Life So Far.
He writes that this "black girl had the obnoxious habit" of tracking down stars to their homes, ringing their doorbells and then "pour[ing] out a Tourettes-style stream of insults, carefully and cleverly constructed to carry a vestige of truth."
She got her comeuppance when she got to to the door of Harrison's home in Esher. He told King: "I let her go on and on until she finally dried up, then I looked at her and smashed in the face, breaking her nose and several teeth. We'll never hear from her again."
He was right. She didn't bother any more celebs.
King's autobiography is reviewed here.