Change the Rule is a poster below you game. You set the rule for the next poster while following the rule set by the above poster. If 24 hours passes with no posters, a new rule can be implemented.
Example:
Player1: The poster below me must post in ALL CAPS.
Player2: TPBM MUST TELL ME HOW AWESOME I AM!
Player3: P2 is so awesome that TPBM cannot user the letter 'e', because we need two of them to spell 'awesome'.
Since, I'm the first poster, I'll start:
The poster below me must have the letter 'a' in their username.
TPBM must type sarcastically using [sarcasm](sarcastic post)[/sarcasm]. Oh, and I should probably say shazam now. Come to think of it, what does shazam even mean? We may never know... SHAZAM! (Are you happy, legend?)