Firstly, Pizza can go bad very fast, if we had 2 Heads, Pizzalike & Humanlike, even our Pizzalike head may go bad very fast!
Secondly, if we had 2 Heads, Pizzalike & Humanlike, our human head may start eating the toppings of our Pizzalike head!
Thirdly, some Pizzas are huge in size, if we had 2 Heads, Pizzalike & Humanlike, our Human head may not have much space left!
Lastly, if we had 2 Heads, Pizzalike & Humanlike, our Pizzalike head may become very popular with kids!