Yeah, my recent brainstorm. Here we pretend we are part of congress; law makers. The poster above you suggests a law, then anyone else can either accept it using a

smiley, or decline it using a

smiley. Make the laws crazy, have fun, just be sure to make a law after you accept or decline the above law.
EX:
ME: People aren't allowed to talk while sleeping
SOMEONE ELSE:
People aren't allowed to drink water while eating
ME:
People....
etc, it doesn't JUST have to be about people, be creative!
I'll start.
All fish must have signs on their back that say what type of fish they are.