Not normally one to throw any of my past writing efforts away, in the hope that something old and near-forgotten may strike a fresh spark of brilliance, I decided to do just that with a hefty mound of manuscripts and a couple of matches. Not one to do things by half, I also reached for a bottle of fire-starter liquid.
No, I didn't suffer any degree of burns - nice of you to worry - but I did pause occasionally to read some of the stuff I was dumping in the flames. In fact what should have been a quick burn-up became a lengthy process alternating between wincing at some of my more pedestrian efforts and wondering how I'd managed to write something I was pleased with. (In fact some of the manuscripts have been published, so it wasn't all failure).
The upshot was, seeing snatches of the unpublished paragraphs in passing, I found some of them stuck, even found their way into my pocket for future reading. And that's the way of writing: all you need is a brief prompt and you're away on the chase for a new story.
One practical thing I did learn (mainly a timing thing brought about by the sound of a police siren approaching the area where I live), is the time it takes to burn a pile of A4 paper. Forget about a quick flash and a pile of ashes; paper doesn't burn that easily. So if you have a character anxious to dispose of some damning evidence before the cops arrive, get them to plan ahead or get caught in the process.