In the Ancient Castle, go to where the catapult is outside to find a moving cart with some hay on it. Bounce on it to find an extra try and some bones. To stop it, let the cart push you towards the gate (which you open by defeating the toy closest to it). After it stops pushing you and begins to move in the other direction, stay where it stopped pushing you. When the cart returns, wait until it is almost touching you, then bark. It will be stuck until you jump on it again.