I don't know his music but I heard he threw the keys out of a small plane his dad was piloting causing them to crash land.
Yeah he's suffered from mental illness for most of his adult life. Which is all covered in the film, as is that incident. It's debatable if he's a genius or not, and I'd say his music would probably leave a lot of people scratching their heads, as to what the fuss is all about. I personally think he's brilliant, as is the documentary.