We have one of the World's Funniest Videos of a guy who got on at the back of the boat. I think I have told this story before on this forum.
It was a guy and his girlfriend on a Hobie 18 at one of our seminars back in the early 1990's. They capsized, and they managed to right the boat with little difficulty. The girl got back on the boat from up near the front and dutifully started getting the sheets organized and preparing her jib. Meanwhile, the guy swam to the back of the boat and got onto the boat over the back beam.
Now, as we all know, when you go to the back of the boat, the boat tends to turn downwind. So the boat turned downwind, the guy did manage to get onto the boat, but then lost his balance and immediately fell off.
The boat took off downwind with nobody at the helm, and did several wild jibes, with the main flying back and forth across the boat.
Meanwhile, the crew was dutifully looking forward, trying to tend to her jib. It was several "interesting" seconds before she noticed that her skipper was not on the boat. At that point she did the right thing, pushing the tiller over and stopping the boat by turning it into the wind.
And meanwhile, on the coach boat, Rick and I and guest expert Carlton Tucker were laughing hysterically as we went to pluck the embarrassed skipper out of the water.
Afterward, the crew said, "I turned around to reprimand him for not controlling the boat properly, and that is when I noticed that he was not there."
It was funny in the context of a controlled environment, hot weather, very warm water and a coach boat right there; but Carlton pointed out on the videotape that it could have been a very serious situation in cold water and without help nearby.
Sorry, we don't have our blooper videos in a form to show on the forum.