Nok Tok finds a big box hidden in the trunk of an old tree. Inside are lots of different things. The Piplings all take something. And then they swap! Nok Tok gets a big brown rock. It's very light. He wonders what the rock is for. When the cheebies arrive, they use the rock to play a game of Pipling in the Middle. Then they play another game, Hop To Rock. But when Nok Tok throws the rock to play, he throws it too hard. It hits a large boulder and breaks in two. Nok Tok tries putting it back together. He discovers it makes a clop clop sound. The cheebies think it's great fun. The cheebies and the Piplings all pretend to be horses. Nok Tok thinks his broken rock is the best rock ever!