Quoted from CrazyLevi:Do your part. If I saw something like that I'd say "hey man, that's a little much." Most people would get the hint.
This right here.
If you see something, say something.
You don't have to chew someone out but you can remind people that the games are someone's personal property, and they probably wouldn't want their own stuff treated that way.
It does require a little finesse at times especially if it's a rage slam type of thing.
The people that do this don't strike me as the type that read guideline signs, but at least try to put some shame on them and let them know the community frowns upon that type of behaviour.
Give them the old Happy Gilmore Chi Chi head shake.
Also if you aren't comfortable doing it, at least let the staff know so they can issue a warning.