Take an old garden hose, cut it into suitable lengths (18" to 36") and lay them on the ground at 40 feet (rifle) or 30 feet (pistol). Each shooter gets one shot to "shoot the snake". You must put a visible hit (half ball or more) on the piece of hose for the shot to count. This also could be used as a "shot only" shot for smoothbores at 30 feet. This can be run as a station on a woods or scenario walk, or a line event. Make sure the ground you are shooting into is soft, with no rocks.
Alternatively, you could hang the pieces of hose vertically at 25 yards with a weight on the end. Allow three shots to cut the hose in two, each hit worth five points, complete cut worth twenty points.