https://www.youtube.com/watch?v=oPPcsfAynyI&feature=youtu.be (https://www.youtube.com/watch?v=oPPcsfAynyI&feature=youtu.be)
That happened to me in MX Bikes.
You think that behavior is whacked out, get a back flip to happen and watch the replay, the riders legs have a seizure and the bike flips all over the place until the landing point. ;D