Not an urban myth....... many years ago, a low hours PPL had a share in an already aged Jodel 112. The A65 engine always requires handswinging (as it has no starter), and this particular one had to be quite well primed to start on cold mornings & as it was early, no-one else was around.
Our hero could only find one chock. No problem, put it in front of the tailwheel, tie the stick back with the lapstrap, prime, pull through 8 times mags off, then stick back, wheel (!) chocked, contact & vrrrroooooom...... the A65 roars lustily into life, the castoring tailwheel jumps over & around the chock and our hero tries to race around the wing to get back to the cockpit.
Halfway, at the wingtip, he realises he aint gonna make it before the Jodel connects with the wooden clubhouse. So he graps the tip (which luckily has a very nice handhold) and hangs on.
The Jodel managed 3 full circles, getting a leedle closer to the clubhouse each time, before the priming effect ran out and the engine mercifully stalled due to the cold.
A few years earlier, I remember reading a newspaper article about something similar happening to a Jodel at Southend airport - except that in this case, the throttle had been left open and it roared across the apron, took off and rolled into the ground. Lucky he didnt have a passenger.........