Personally, I had a physical reaction when I accepted libertarian ideas. I distinctly remember feeling nauseous and having a migraine after reading Ron Paul for the first time and realizing he was correct. Then, the same thing happened when I found Stefan's videos and watched his videos on anarchy and realized he was correct. Could be a weird coincidence I guess, but I've always thought it was interesting. I think the case could be made that reaction was psychosomatic.