by Patrick Appel
Scott Adams devises one:
Imagine an objective standard for deciding who is entitled to have an opinion on a topic. All we need is some sort of wiki (user created website) where the basic facts on any debate can be assembled in the form of an ever-evolving multiple choice test. When you find yourself in a debate with someone who hasn't yet passed the test on that topic with a score of 100%, you declare yourself the winner by virtue of being better informed, assuming you scored 100%.
If both of you have taken the test and scored less than 100%, you declare yourselves "not entitled to your opinions" and walk away. If each of you scored 100% then you are, by my definition, entitled to your opinion.