Propulsion seems like a cop-out. Yes there would have been a little bit of counter-reaction, but only the slightest little bit and that in a direction exactly away from the mark.

For the record, I didn't do this, although I was sorely tempted . Doing a 360 in a dead calm is not fun.

Edit: I guess I should come clean. What I did do is blow on the mark. I think it nearly worked, but I did end up hitting the mark right near the transom. Several other boats saw me, and just laughed.

You have to realize that we were all just sitting there, just spitting into the water every now and then to try and see which way we were drifting.