I was sitting on my Rancher AT, it was idling in reverse and I just touched the throttle to back it up a little, suddenly it roared backward at full throttle so quickly I couldn't do anything. Fortunately it was only eight feet from my camp trailer which it hit causing some damage to the trailer and ATV. I was lucky, when it hit the trailer, I was far enough to the the side that I was thrown clear and landed on my back. I was wearing a helmet so my injuries were small. I have never seen any vehicle accelerate on it's own. It has fuel injection. I wonder if something is wrong with the computer. Has anyone else had a similar experience?