Hard to believe this...?
NTSB Identification: MIA07CA138
14 CFR Part 91: General Aviation
Accident occurred Saturday, September 01, 2007 in Okeechobee, FL
Aircraft: Anthony J. Bencivenga Aventura II, registration: N444LT
Injuries: 1 Uninjured.
The pilot stated he departed from the Okeechobee Airport and headed toward the lake to practice touch and go landings on the water. When he arrived at the lake, he turned into the wind, which caused the nose of the airplane to rise. He over corrected, causing the nose to dip sharply. He had his hand on the throttle. The abrupt movement made him apply full throttle and push the flight controls to the left, which the airplane made a sharp left turn throwing him out the right side of the airplane. The airplane leveled itself off and flew about a mile before it came down and flipped over in the shallow water. A friend, whom was flying with him in his own airplane, saw what had happened. The friend called for help and got the attention of a nearby fisherman, which come to his aid and brought him to the shore. The pilot stated there were no mechanical failures or malfunctions to the airplane or any of its systems prior to the accident.


Full narrative available

I bet 10 to 1 odds that he tried to roll it and pushed negative in the inverted without a seatbelt and fell out of the dang thing.

That explains the full throttle and full left aileron control, as well as throwing him out of the aircraft not to mention the inverted state of the final resting place.

If his "buddy" was in another aircraft and watched the whole thing it will probably show up on YouTube before too long.

Seatbelt? Skill? Training? Common sense?

Natural selection at work with the unfortunate accompanying bad press for GA

I'm going to say that the account is probably partially true...he probably dropped it in hard, prob wasn't wearing a seatbelt let alone a shoulder harness. The Aventura is an open cockpit ultralight style aircraft, so ejection out of the cockpit/hull seems pretty feasible.