We were at a local boat launch and had just come out. The next guys in behind us had been out on the lake a long time, and alchohol was involved. They had a small pickup to pull their old tri-hull with. One guy in the boat one in the truck. Guy back down, get out ouf the truck, leave door open and apparently in gear, or as a minimum, no parking brake.

End result - by the time the guy got back into the truck the water was up to the top of the seats. We did not stick around to see the extraction process.