Originally Posted by CDSmith

You know you may be a conspiracy nutjob when:
A) you find yourself often passing off your opinion as fact.
B) seeing the facts others throw at you as opinions.
C) confusing fantasy with reality.
D) disbelieving or otherwise challenging the authenticity or accuracy of virtually anything and everything anyone tells you, or reports to you via the news media.

Of course, just as jerks don't know they're jerks, paranoid conspiracy types often don't have the self-awareness to realize they're exhibiting such symptoms. They are simply certain and utterly, hopelessly convinced they are 100% right.

In other words no, you can't win an argument with someone that deluded.