Houdini's Hound(2003)

Fredrik wants to impress his cousin Klara by being Harry Houdini, but Klara wants to keep Fredrik on the leash. They compromise by making up a game called ”The Houdini-slave”. The Houdini-slave has to do dangerous things, and gets buried in the sand on the beach. There is no way he can get up. But when Klara comes back, he is not there.