It may have been scary for my horse,.. but I think it was way MORE scary for me!
Shortly after I got her I was working her in the round pen and she was trotting and trotting and trotting and trotting..... all I was doing is standing in the middle watching her trot around me hoping that she would eventually come in to me. But all she would do is run around in circles. So I thought, if all you're going to do is run, you might as well change directions.. so I turned my body to get her to change directions and she half halted and [tried to] jump OUT of the round pen... missing terribly - her weight and momentum bent the panel and she rolled over the top landing on the other side on her back.. continued to roll over 'til her feet were under her, got up and ran away.
Other than being sore the next day, she was fine.