I had a mooring in Rockland for a summer a few years ago. There was one boat that seemed to take great joy in passing close aboard my stern at full throttle and full wake. (i.e. within 20' of my transom(s)). Of course, as a multihull, I didn't roll my gunnels under and it really didn't cause me any grief--other than the knowledge that it was a deliberate act by someone who had no disregard for others. They're out there!