The idea here is to create a law (Just like politicians are wont to do.), then the next player vetos the previous person's law and MUST GIVE A REASON, then posts their own law. An example of how things would work is:
Poster 1:
I hereby create a law where persons can only wear green on Tuesdays from 9am to 9pm.
Poster 2:
I veto your law because I have nothing in my closet that is green colored to wear.
I hereby create a law where you must eat carrots for breakfast.
Poster 3:
I veto your law because I am allergic to carrots.
I hereby create law to.........
Etc., etc., etc.
So, I'll start:
I hereby create and pass a law where it is illegal to carry, possess, and drink Coca-Cola beverages.