Friend of mine..... who was extremely impatient.....forgot to remove the rear tie down when launching his boat down a steep bank at the river. Never have figured out exactly how he did it, but he somehow managed to force the boat off the trailer, flipping it upside down and sinking it in the river in the process.
I got there just in time to help him get it out.
Never did get all the gear back.

He's the same guy I watched drive his truck right through a campfire. He was dangerous to be around.