I had a beautiful two-story wood and stone home I finally finished building. I had spent so much time getting the roof right, and everything else. Then, with a flint and steel in my hand, I tried to close a door. My first thought was, "I set myself on fire!" Then I realized it wasn't just me. Soon most of the wood, at least 80% of my house, was gone! About 5 minutes after the fire was out, it started to rain. I could cry.
Ugh. I feel for you. Probably happened to many in some way shape or form. One time I lit something on fire by mistake and the wood around began to burn. I thought I had it out with minimal damage. Apparently I missed one spot. Later went around the back of the building only to find most of it missing.
It was a fairly new house. I had just finished it, for now, and was building a nether portal in the basement. That's why I had the lighter in hand. Luckily, most of my valuables were elsewhere. The dog is ok. I had to go hunting for cows and pigs, though. The most ironic part, even more than having it rain after the fire was out, is that I was playing in peaceful mode.