A UK trainer had two different horses entered for two different races today. somehow they got mixed up,
the horse entered for the second race went in the first race and promptly won at odds of 50/1.
A lengthy write-up on the sleight of lip by Innisfree Farm whose annual derby selection is preceded by an essay on some of the more obscure history of horse racing. http://www.innisfree.org/PDFs/2013.pdf