A skydiver jumped up and out of the airplane instead of dropping out of the exit and keeping a low trajectory. He then impacted the horizontal stabilizer and fell away from the leading edge. The skydiver's automatic deployment system activated and opened the parachute. The skydiver was warned by other skydivers the day before when he exited in a similar manner. In addition, he was instructed to stay low and not to jump up just prior to exiting the airplane.