THE AIRPLANE WAS OBSERVED FLYING LOW OVER TREES PERFORMING A SERIES OF PITCH UP AND DOWN MANEUVERS, TURNING LEFT AND RIGHT, THEN DESCEND STRAIGHT DOWN INTO TREES. THE ON-SCENE INVESTIGATION REVEALED NO AIRFRAME OR CONTROL SYSTEM FAILURE. THE COUNTY SHERIFF STATED HE DETECTED A STRONG ODOR OF ALCOHOL ON THE PILOT AND ONE PASSENGER DURING HIS ON-SCENE ACTIVITIES. THE PILOT'S AUTOPSY IDENTIFIED 0.06 GM OF ETHANOL PER 100 GM OF LIVER TISSUE.