Let me preface this by saying I like a lot of movies that others seem to consider bad. Particularly I like Sci Fi, and I like dystopias. I sometimes try to justify my opinion, this time I won't.
I like Demolition Man. I don't like most of Stallone's or Snipes' movies, but this one gets me. I like the dystopia future of San Angles, and the writing is good and humorous.
One of the dialogue jokes in the movie is the mysterious replacement of toilet paper in the bathroom by the use of 3 seashells. The answer is never revealed in the movie. i-Mockery.com seems to have found the missing instruction poster.
How to use the Three Seashells!