We have tons of rules posted clearly to try and maintain human-like behavior. On the back tables where most bangers will congregate we even have the most basic rules actually laminated and posted on the table rails.
No Sitting on Tables, No Drinks on Tables, No Cigarrettes or Ashtrays on tables.
Its a constant fight to keep junk off the tables. We have coat racks and shelves EVERYWHERE in the room. Regulars always try and block off other tables with cases and coats etc to keep people off them. This way it blocks off 3 tables for the price of one. Every time they act like they are surprised other people want to play pool and apologize and move their stuff. Its a game I got tired of playing years ago. But everyone still does it. Seems kinda pathetic. Of course I have to be a total a**hole in my behavior just to get the point across for the 1000th time.
Our showroom has been nonsmoking for 3 years now and regulars will still light up walk around the showroom and yell "where are all the fvckin' ashtrays?" What can you do? You can't bar everyone.