When I learned that the whole culture, language and everything inherits from Hungarians, and that Hungarians already invented everything but the evil Jews want to take over the world and Hungarians come from Sirius and and.... whatever.
It took a while to de-learn all these crap (my Hungarism lasted about 2 years) but my mind was definitely blown when I heard these things in a beautiful summer evening walking around in the beautiful down-town of Budapest.