Truth be told this actually happened to me. I hit some black ice and slid into ....................a police car that had slid to a stop to investigate a third vehicle that had gone over the curb and down an embankment. Fortunately when I made contact with the law I was sliding at .0004 miles/hour. The damage was minimal, and the officer was very understanding, but could not report his own accident. We had to wait for another police car to write the accident report.