Furious Pete?
If you don’t know who Furious Pete is, you should definitely check him out on YouTube. He’s a competitive eater who set multiple Guinness World Records for eating pizzas, which is absolutely bonkers. We have an inkling that Pete and a competitive eater buddy of his did the OP’s pizza buffet dirty.
One moment, the two have two large pizzas sitting in front of them, and the next moment, they’re gone. This happened over and over again for the entire three hours the restaurant served all-you-can-eat pizzas. We’re surprised the two didn’t blow up to bits of human flesh and pizza afterward.