Last journey of a derby car, flag hanging limply in defeat, resting nobly under a misty moon at a rural show. Demo derbies are inevitably the last event of agricultural shows, churning up ground that valuable livestock walked only a few hours before, filling the arena with dust, smoke and the laughter of locals as feuds and alliances are played out in front of them - a raucous end to a year's preparation of harvests, animals, and chutney for ribbons and acknowledgment in the local community.