At 1520 central time, a Piper PA-20 collided with the runway following an abrupt maneuver while landing on runway 27 at Wittman Regional Airport. The pilot suffered a minor injury and the passenger was not injured. The accident occurred during the EAA AirVenture 2002 convention. The airplane was cleared to land on runway 27 and the passenger yelled that there was another airplane in their flight path. The pilot pulled back on the control yoke in order to avoid the other airplane. The airplane stalled and struck the runway. The other airplane had been cleared to land runway 18. Air Traffic Control was operating under the VFR Arrival Yellow Flow procedures as outlined in the AirVenture Notam.