I posted this one before but here goes.
At a dressage schooling show with my young mustang who hadn’t had much exposure to the show environment. We started out fine, she was a little wiggly but not naughty. We were doing our canter circle at A and she comes to a screeching halt. There was a jump standard that was stashed against the wall just outside the ring and she was sure it was a monster. She stood there and stared at it with alarm bells going off in her head. I finally got her moving again but she gave it the hairy eyeball every time we had to pass it. Judge’s comment - “Loss of forward motion.” LOL