You 'could' just use a knife, or have a separate pizza cutter... or better yet, use your hands! But if you want something wierd, you can get the combination utencil that has both a pizza cutter AND a fork. Wowzers.
"From ultra thin to deep dish, pizza is your passion. The Pizza Forkâ„¢ makes it easy to swiftly cut through crust and toppings no matter how thick or crisp. It has the same cutting wheel as a pizza cutter along with an extra-long stainless steel fork so you can slice and eat your pizza with one handy utensil." - Clever Gear