Combustion

Do try this at home. Ingredients: one stone to scratch glass, 1 hammer, 1 lamp stand, 1 pair dark curtains, 1 block extension cable with switch, 1 camera, 1 shutter release cable, 1 tripod, 6 tungsten light bulbs, 0 photos of any merit earlier in the day.

Thanks to Pregh for showing me how to do this.