So technically every standard pizza you order from your chain of choice could be a Pizzagon, because it has 8 pieces that, should their crusts be cut straight across instead of rounded, would make an octagon. But no one's done it yet, so...Pizza Hut? Dominos? Call me.
(If this doesn't work out I'm going to write a YA novel about a modern-day gorgon named Pizzagon, who has stringy cheese for hair and turns everyone who looks into her pepperoni eyes into pizza and all she wants is someone who loves her for her personality and not because she smells like really awesome pizza. So basically I'm really hoping Papa John will call soon.)