The list of rules in Seattle parks may be about to grow. A proposed ban on spitting in parks — one of 13 behaviors Seattle Parks and Recreation wants to regulate, including a ban on smoking on its grounds — already is generating heated public comment. [snip] Besides spitting and smoking, the newly prohibited behaviors would include going into a restroom for the opposite sex, "sexual misconduct," possession of fireworks and other explosives, using flammable liquids and leaving packages and backpacks unattended. Some of these behaviors already are prohibited by existing law but have not been itemized in parks regulations.