On XXX, while in the parking lot, after placing the car in 'park' I then placed the auto into 'reverse' to straighten out the auto in the parking in the space. However, the car automatically changed back to 'park.' Then tried to place the auto in 'drive' and again the the auto switched back to 'park.' I then turned off the engine and decided to begin the process again but experienced the same problem. After doing this once more and while the the auto was in the 'drive' position, and even though my foot was off the gas pedal, to my surprise the engine revered up with a rapid unintended acceleration. Before I could react, the auto went over the dividing curb and the parking island separating the row of cars. It then proceeded to slam into the auto in the parking space in front of my car before I could react. Extensive damage to both automobiles occurred. Both cars in now in their respective repair shops, which will be coved by my insurance. The accident occurred at the Gym located at [XXX]. The accident was reported toXXX and officer [XXX] badge # XXX responded. Their Accident Report will be available next week at the Englewood Police Department - report #XXX. Please let me know if any clarification is required. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)