flashback begins about 35sec mark
http://mashable.com/2017/03/22/man-fails-control-retired-race-horse-gopro-footage/
That's the thing about riding something with its own brain.
https://www.youtube.com/watch?v=k4gKPULa41Q&feature=player_embedded
My yz does shit like this to me every now and then.
He adopts a horse that needs a home and
He laughs about himself falling off when he discovers that the horse he bought has 2 speeds: fast and really fast.
Clearly, this guy is good people.