Detective Conan - Season 1 Episode 1068 : Tsuburaya Mitsuhiko's Detective Notes

Conan, Haibara, Ayumi, Genta, and Mitsuhiko arrive at a takeout pizza restaurant. They participate in the store's campaign to guess the weight of a ball of pizza dough, and thanks to Genta, they win a free pizza. After splitting the pizza into fifths and placing their slices inside special boxes, they head home. On their way, all of them have their pizza stolen by someone. When the kids meet back up, each one has a torn pizza box. Conan and Mitsuhiko realize based on the damage that the culprit was after their boxes.