Immediately upon making a low-speed contact of my back bumper with a pole, the engine revved loudly. I attempted to go from reverse to drive to get some clearance from the pole. I then immediately attempted to put the car in park so I could get out and observe any damage. Immediately, the car accelerated extremely suddenly and quickly. I went over a curb where I had parked prior to backing up and contacting the pole. I hit a landscaping decorative boulder and a young tree. It was clear that my car was headed into the two-way street straight ahead since it was clear my breaking efforts were useless. I believe the car went airborne for a second, landed and continued straight, thankfully not hitting any vehicle or pedestrian. I saw a parked black full-size pickup truck and figured we would hit it, we did. I thought if the truck didn't stop us then we would continue into the building just beyond it. We landed on a memorial boulder next to the truck with the front end on the boulder and the rear of the car low to the ground. It was very difficult to exit the driver's door because the truck was angled so that my door wouldn't open much. It was difficult to get the door handle to actually open the door. I kept trying the lock in case it was engaged. I squeezed out praying loudly for God to help us, over and over again as I squeezed out. I thought the engine was on fire - I thought I saw smoke but later realized it was the powder from the airbags. I was trying to get to the other sid