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@hippy
Fill the close bin with petrol.
In the second bin have tilt switch (http://www.testco-inc.com/search/category:tilt-tip-over-movement-switches/cId:11115) connected to a piezo sparker (https://www.catersparesuk.co.uk/product/electric-battery-operated-piezo-spark-ignitor-22mm-hole-bbq-6-burner-6-output/)
Film.
Profit.
(don't actually do this)