Literally. No one knows what happens. Pictures starting surfacing over at http://thesupercarkids.com/upside-down-av…

My guess is that he hit that embankment pretty hard and flipped. Or slightly less obvious, he drove off a tall cliff and ended up falling roof down on to this road underneath said cliff. Or perhaps his front axle lift kit was set to up a bit aggressive? All we know is, he didn't know what he was doing.