The guy didn't have a line on his trailer and it didn't stop until the tongue was about 3 feet under. The guy climbed into the boat and drove it off, leaving the trailer obstructing the ramp. Angry people who were waiting to launch another boat pulled the trailer out and hauled it into an adjacent boatyard where I was standing while shooting the video, and the guy came back and couldn't find it right away. There were a number of local retirees watching this whole scene unfold from a nearby porch; they had a good laugh and are still laughing about "the idiot who launched his boat by hand and left the trailer".