Troll 2. So many quotable lines and unforgettable scenes. And you don't even have to watch Troll 1, because there is no Troll 1 - at least not in relation to, or in the context of, this film.
I absolutely love Troll 1 for the simple fact that the main character was named Harry Potter and he asks a witch to teach him to be a wizard halfway through the movie. It came out 11 years before the Harry Potter books.