First fall: I was riding my little shetland pony, and he put his head down to eat grass, and I sort of just, slid off! I was only 2, bare in mind :P
Worst: When I was 10 years old, I had a little pony called daisy, I had had her for about 6 months, and one day, we were doing the same thing as normal, when I decided to go into trot and she did an ENORMOUS buck. I was catapulted a huge distance. But by no means was she finished yet. She came over to me and started to canter over me, back and forth, back and forth. I was very, very lucky that she did not have shoes on or I might not be here today. My mum managed to drag me out from under her. It happened twice more, without the trampling. We then sold her, as she was very, very very dangerous. She was more of a boys pony anyway. We probably should have had her shot, as I'd says she was sick in the head. Last I heard, she was in Portugal, as stolen property... See we got a call from a lady in Portugal asking if the pony was ours. We had had her micro chipped you see! We said no, and if possible to shoot the awful thing.