No surprise that he crashed but the aircraft manufacturer was held liable. Probably for not having a label "Do not try to fly the aircraft from other than the designated seating positions."
it is crazy.
I fell at Walmart. I slipped in a spilled milkshake. After i got up, i told the door greeter what happened and went home. It did not occur to me to sue Walmart. I was embarrassed that i fell in the first place!