I just went out to get some groceries, I had to yield to a police car who didn't seem to expect me to and he turned right in front of me. A few yards later he cut me off to park on the sidewalk on our right. Not really a problem because we were both going slow but I had to hit the brakes and steered around his left. I looked to the driver to check if he had seen me at all and the young cop already had his window down and said "Sorry sir". Surprised that he called me 'sir', I'm not that old, I answered "I'll let you of with a warning this time, young man!" and rode on while I heard the cop next to him laughing.