One of my colleagues some years ago had just finished 'doing up' his semi-detached home for his little family and the prat next door used a blow torch to remove old paint from his bargeboards. He set the whole roof alight and the two houses were left a smouldering ruin. The poor man sat in our staffroom and sobbed his heart out, we were all in tears. They were put in hotel accommodation for months while the thing was rebuilt. But it seemed to affect his marriage, and shortly after, they separated. Horrific.