The one rule you must follow is to follow no rules.

The one rule you must follow is to follow no rules. 

If you follow the rule of not following any rules than you are breaking the rule of not following any rules, but if you don't follow the rule of following no rules, than you are following rules, which would break the rule of not following any rules. So either way you're breaking the one rule you have to follow. People's heads could probably explode from thinking about this problem a lot. Logicists have spent more than 10 years thinking about this problem. Yep! Don't think about this too much!