Ouch . A lot of these made me shudder.
I Have a few but i'll share one with you guys. I was riding a new horse at my barn and he's a warmblood but he's very awkward and lanky and he's very heavy in the front, so I tried to keep him collected the whole time. I went over a few jumps then gave him a break and started to canter, he completley tripped and fell on me. I thought that Wow that wont happen again...two days later I get on I jump him over a vertical and we went to do a roll back and BAM he falls on me and I crack my nice IRH Helmet, besides that not much but a few bruises and I came out okay.