A lot of movies listed in this thread that can't seriously be considered "worst ever". I think people have only seen 10 movies in their entire lives, or they post a controversial (for whatever reason) movie to get a rise out of people that like it.
Starship Troopers... seriously? The film was brilliant. A lot of people don't "get" the movie, true, but a) you obviously haven't seen Starship Troopers 2 or 3, which really are awful, and b) Starship Troopers should be disqualified from being "worst ever" if only for the spectacular special effects, which actually look good, nothing like today's crap CG that passes for special effects. It didn't live up to the book? Fine, I haven't read it, but that shouldn't diminish the movie. Also the soundtrack to Starship Troopers is one of my favorite movie soundtracks of all time. Any of these are enough to disqualify it from "worst film ever".
Anyone that doesn't like Pulp Fiction should never ever watch a Kevin Smith movie. I'm guessing you'd dislike those for the same reasons. As an aside, my parents also walked out of Pulp Fiction. I thought it was pretty dang good. But if you think its worst-ever, you haven't seen many movies.