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Caveman: Um... why you stand in rain? Caveman: It not raining. Cavemen: Yes it is. Caveman: No it not. Caveman: Huh? Water fall from sky... that rain. Caveman: That your opinion. Caveman: Not opinion. Fact. See? Raindrops. Caveman: Don't need to look. Already know it not rain. Caveman: If it not rain, then why you wet and me dry? Caveman: Define "wet"... Caveman: Oww... brain hurt. The invention of ideology.