What are your rational and irrational fears?

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Everyone has fears (I think). My rational fear is heights a la Vertigo, and my irrational fear is silent movies. Silent movies for some reason creep me out. One day I was watching tv flipping through channels late at night and a silent movie was playing and I got really creeped out. The makeup and the lighting of the movie and the tone of it was weirding me out, it wasn't even a scary movie per say, but it creeped me out. So know I cant watch silent movies. So what are your fears?