I was talking the flyshop guy about this thread and about the crazy things people put on their tubes.
He told me a story about a customer of his that put a 55lb thrust min kota mounted behind him on a belly boat. ( don't ask me how ) Starting out for the first time He forgot to tighten the up/down depth control knob on the propeller shaft tight enough. So when it started the motor dropped down about a foot as of course did the propeller. When he connected the battery terminal clip the motor came instantly on. He had left it set on #5 the highest setting in forward instead of in the off position. His plan Had been to troll on # 1 or #2 in reverse so the motor would pull him along backwards at a comfortable speed and steering assisted by his fins and by dragging an net on the proper side if needed. Instantly when the clip was attached. The motor dropped down all the way so that the propeller was down far deeper than it should be, and facing in the wrong direction plus being instantly at full throttle. The tube gave a jerk over stressing the battery strap so the battery which was behind him on a strapped on board slipped even farther back than it was supposed to be so his balance was even further off. .
All of these things working together now combined to nearly torque the fellow over backwards out of controll. He now couldn't even turn it down or off because on its new lower position he couldn't reach the handle. After a short frightening ride he was able to yank one of the battery clips off. He was unhurt by the wild ride Which witnesses said was a short one with the tube trying to porpoise up and down. The battery finally did fall off but was recovered.
No one was hurt and Sadly this fellow is still in the gene pool.