A while back I went in a shop and realised I'd need my mobility scooter (easy a tardis with warehouse hidden out the back) so DP went back to get it from the car. Unfortunately I didnt see the following, just the aftermath:
He got the scooter out of the car, and because there were people around he didn't want to drive it. Turns it to slowest setting and walks with it holding the handlebars. This is too slow, thinks he, so he turns the speed up. Presses hand on lever to make it go forward, scooter leaps forward, is steered in front of him because he's holding the handle bars, and he's catapulted over it onto the tarmac.
At this point in his telling I was all sympathy, but then:
He still had a way to go, and thought he'd got the hang of it now, so didn't need to turn the speed down. Exactly the same thing happened. By the time he got to me he was going very slowly, limping, and bleeding. Bruise on his hip took ages to go. I tried to be sympathetic, but still snigger slightly at the thought of his second flight over the scooter...