Nod is clearing out drawers. He found a large number of old cigarette lighters and chucked them into a carrier bag for later disposal. He hung the carrier bag on the inside of his front door to remind him to take it to the bin.
A little later he added the contents of an ash tray to the bag.
UNFORTUNATELY
An unextinguished fag end started a small blaze which cause the lighters to explode and set his front door on fire