While I was doing parallel parking, the car on its own went into involuntary, sudden, uncontrolled acceleration & hit a tree & bushes resulting into considerable body damage. Then I called Subaru national customer relations representative & I was told to go to the local Subaru dealer where I had purchased the car about four and a half years ago. The mechanic there told me that he had never heard such incident & he said that since there is no engine light on, there is nothing to scan. And he thought the car was okay. So, I am driving it very cautiously. But, I am concerned. We thought the newer such cars are safer with the high-tech computers on board but I countered this safety problem that I had never come across before.