Approaching a roundabout on a motorcycle pillion I saw a car appear over the top of the cars on the same road, do a 360 degrees longitudinal roll and then vanish as it dropped down onto its wheels.
It had been traveling around the roundabout too fast and lost grip, hit the barrier and jumped over it onto the < of grass alongside the road.

We stopped as there were cars every which way on the road as the drivers flinched away from the flying car.

One passenger in the flying car was stunned as he had not been wearing a seat belt and so had hit the roof.
We left as the cars were sorting themselves out and we could hear the sirens behind us as the emergency services were trying to get through.