The rules are simple but must be adhered to at all times. Simply post a statement of something extremely obvious. The next person has to post something very obvious also but may also post a comment if there is an exception where what you stated might not allow the obvious thing to happen.
Poster 1) If you turn on a flash light it will emit light.
Poster 2) ^ not if the batteries are dead.
Poster 2) You will not survive falling off of a tall building.
Poster 3) ^ not if you have a good hang glider.
Poster 3) If you step on a tack with your bare foot it will hurt.
OK, you got the idea. Go for it!
last one was :
Cow hides can be called leather.