Dementors caused a person to relive the worst moments of their life. What would spoiled, pampered, bullying Dudley have been forced to hear?
J. K. RowlingFred, you next," the plump woman said. "I'm not Fred, I'm George," said the boy. "Honestly, woman, you call yourself our mother? Can't you tell I'm George?" "Sorry, George, dear." "Only joking, I am Fred," said the boy and off he went.
J. K. Rowling