Deep, deep down we're all thinking about something dark and running with tracks and rubber guides -- half-submerged caves, tunnels, and doors that bang open when our car runs into them. This is the inner dark ride. A place with running water and deep tunneled streams that push along hollowed-out logs for us to sit as the surroundings coast by. The best dark log rides are complete with the murky, moldy scent of fifty-year old clorinated water.