One day about 15 years ago, some friends of mine were out ice fishing with their planes on skis.
After fishing, they propped the vagabond, and away it went at around half throttle.
The plane gently circled a couple of times around the lake, passing quite close to the other aircraft.
One guy grabbed the sleeping bag that he was using as an engine tent and ran out to try and throw it into the prop, in an attempt to snuff it. Once he realized that this was way too unpredictable, and dangerous, they let it go.
It just dragged itself into the air, and tried to climb away, but with the reduced throttle setting, it climbed, then stalled into the ground destroying it.