I had a horse that I swear was part lab..he adored water. We were riding an outdoor trail class, utilizing components from a cross country jumping course..one of which was a water element. The task was simple...walk in, walk out, except, my darling boy stopped dead in the middle and started pawing like mad splashing water everywhere. It took me forever to get him out of the thing. People watching that particular element had tears rolling down their faces they were laughing so hard.
When I finally got him out, he finished the rest of the elements beautifully; we still placed second as the judge indicated on the write-up that the horse obviously wasn't afraid of the water but that he had to ping me for not being able to get him to obey the command to move forward :)