His son had suffered a compound broken leg, broken ankles, broken ribs, a punctured lung, a broken sternum, a broken neck, a broken nose, crushed eye sockets, a crushed forehead and a fractured skull, Bothe said.

CNN: Fatal wrecks underscore risks for young drivers

An autopsy found the passenger's ankles were broken on impact, suggesting she was kicking the pilot's seat forward, the board said.

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With nothing to keep a wearer's foot in place, flip-flops can also lead to tumbles, twisted ankles and even broken bones.

CNN: Flip-flops present feet with a painful problem