I wanted to swap the 3.5 HP outboard with the 6 HP so I rowed out and removed the 3.5, brought it in, put it in the car and loaded the 6 HP into the dinghy and rowed back out.
Bad idea. What I should have done is bring the boat in to the dock, and made the O/B transfer on something solid. But nooooo....
I was about 1.5 seconds from getting on the boat when a sudden weight shift (still not sure where) sunk the dinghy's bow and almost instantly swamped the whole g.d. thing and capsized it, sending the O/B down to the bottom and leaving about six inches of the nose of the dinghy above water. I remember standing on the transom of RAINBOW thinking, "OK, that could have gone a lot better."
I never EVER move an outboard without a security rope belaying it, so I just had to grunt the thing back on board...what a mess. Then I had to right the dinghy, and that was a beast. FInally got it floating, sort of, but needed about 15 minutes to bail it out with a two-gallon bucket.
Lesson learned: if you think you're doing something stupid, you probably are. Don't take shortcuts.