founding role in RV Flight Safety
Great stuff, Jabawocky!
I'd like to quote some of your comments there to a few others.
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I witnessed an accident many years ago at an airshow. Row of aeroplanes parked either side of a temporary grass runway - made inactive as a runway to be used for parking as heavy rain had made other parking areas unusable. An aeroplane (it looked like an aeroplane anyway) started moving very quickly along the clear space between the rows of parked aircraft. My guess is that it would have got off the ground before long but it didn't fly, that day anyway. I don't know how it got there in the first place.
Its wingtip clipped the spinner of one aeroplane which caused it to spin around 90 deg to the left and chop through the wing of a new homebuilt. Splinters flying everywhere.
Talking to the owner of the homebuilt later: the driver of the other vehicle didn't have a licence, the aeroplane wasn't registered nor insured. It didn't fly so CASA wasn't going to do anything - not a pilot, not an aeroplane.