It's hard to believe some people still believe this, but some people still think the Egyptians lived and did everything in pyramids.
*laughs* I know some people (back in the 18th/19th centuries) used to believe that the great pyramids were Pharaoh's granaries, built under the supervision of Joseph during the seven fat years, but having the Egyptians living and working inside pyramids is even better!
Moving back into geological time, there's this guy I read (he was writing some time before the discovery of the Yucatan crater) who suggested that the extinction of the dinosaurs was due to the big apex predators, T. Rex and the rest, becoming so effective they eradicated the veggie-eating species and...hey, presto! Suddenly there was nothing left for the remaining meat-eating ones except your own kind!
Actually, it's a long-standing debate topic whether Tyrannosaurus and the like would have taken on Brontosaurus and other really big vegetation-eating beasts, who could be three times their size or more. Perhaps sometimes if the former were pack hunters, but that we don't know. Anyway, those big ones mostly lived in swamps and lakes, where someone like Tyrannosaurus would never have ventured deep in, and of course there's no way T. Rex could have singlehandedly
driven even a couple large species of dinosaurs extinct...