I believe they call that "head over teakettle"
Nothing will humble someone quite like getting unsuspectingly tossed over the handlebars and that’s exactly what happened to this old timer. Either the water was deeper than he anticipated or he found traction sooner than he expected. Either way, we’re betting he’ll proceed with a little more caution next time.
ATV.com recommends ATV riders always wear a helmet when behind the bars.