The most embarrassing US horse racing moment of all time?

Obviously not connected with your OP,but I still squirm when thinking about an episode of "Get-In" in Jan 2013. Ramon Dominguez,who had been the leading US jockey for the previous 3 years,took what was a clearly very bad fall at Aqueduct one (UK) evening.The commentator adopted a suitable sombre tone but Harvey,who to be kind probably wasn't watching,found this uproarious,accusing him of being upset because he had backed the fav. To his credit Weaver,who plainly HAD been watching and realised it was a horrible incident more or less told him to shut up. For Dominguez it was career-ending.

I remember it -horrible incident.Ramon was the king at the time.