This Andy Lau fan is indeed a couple of french fries short of a Happy Meal, but the ultimate celebrity fan worshipper turned insane is still John Hinckley, Jr., the Jodie Foster fan who, in 1981, shot the President of the United States (Ronald Reagan) just to get his idol's attention.
Miss Yang here still has NOTHING on Mr. Hinckley. Miss Yang's actions led to the death of her father, but Mr. Hinckley's *almost* took down the Leader of the Free World.