Dunno, haven't really had any 'bad' bad experiences - when I was a young'un (about 9?) and the photography was my dads hobby, I was printing a picture of my sister in the cupboard under the stairs - exposed the print, then dropped it where it fell into the gap under the door (yep, we had one too!). Anyways, developed it, and it was real wierd - background clear, sister perfectly fogged with 'trails' eminating from one side. Had them going at school for WEEKS that I'd photo'd a ghost..... (",)