Everyone makes mistakes.
I was reversing out of a parking space and looking over my left shoulder to watch for oncoming cars (one way system car park). Next thing I know some lady has driven in the exit, and parked in the space next to me while I was reversing. Inevitably my front bumper hit the rear arch and wrote her KA off. Apparently all my fault even though I had witnesses and checked my surroundings before starting the maneuver...
Forgot to mention that she tried to claim for personal injury.. not at all bitter