Walk to a creek in a wooded area. Hunt around in the underbrush until you’ve collected a pile of medium-sized sticks. Situate the pile on the creek’s bank in a location permitting a straight channel of water to left and to right, and plenty of small available stones nearby. Throw one stick as far upstream as you’re able. As it drifts downstream, take aim, and attempt to hit the stick with thrown stones. Continue to throw stones as the stick drifts past and downstream, until it’s out of sight. Throw another stick upstream.