I wouldn’t go far as to say I’m a die-hard HP fan but I remember reading the books (I remember when they were all the rage!) and seeing the films. My favourite book in the series is the very first one, the Philosopher’s Stone (or Sorcerer’s, depending on where in he world you lived) because I remember my mother giving it to me as a Christmas present and it was what really set off my obsession with HP.
If we’re talking movies, then Goblet of Fire ranks pretty high on my list.
Just a bonus question: has anyone ever taken a test to see what house you would be sorted into? I did and got Ravenclaw.