I've not had really bad falls *touch wood ;)*. So i'll explain my last fall. I was doing a dressage test in the indoor at my yard (so my pony knows the arena really well!). Well the test went reallyreally well apart from the final halt and salute at x. We trotted down the centre line just fine, as I asked for halt he slammed on suddenly and did a massive rear, flipped over backwards (by this point I was falling backwards with him). I landed on my back and he landed on his side, then he got up and galloped off bucking and enjoying himself. There wasn't even a reason for the rear! He didn't spook, there were no loud noises, he'd never actually done a big rear like that with me before either. Silly pony.