I used to work with a certain ppl holder with a lightweight Rotax powered biplane (Renegade Spirit). He was having trouble pull-starting the engine in the normal way so decided to give it a go from outside. He thought he had covered all his bases by tying the tail-wheel to the hangar door framework with a piece of rope.
I think he'd flooded the engine so he tried increasing amounts of throttle. When the engine finally fired he had the throttle open a long way. The too-weak tether broke and the aircraft set off by itself. He decided to grab the wing as the aircraft rotated around him on the concrete dispersal. You can imagine the rest. Round and round until he was dizzy so he finally had to let go. The aircraft shot off again, got to the end of the concrete and nosed over hard on the grass.
He didn't keep it long after that.