I was up a ladder once painting the eaves on my garage. It was the middle of a major heat wave and the grass was dry and brown. When I was up the ladder I used to take a few drags then pinch off my cigarette and put it back in my pocket. I noticed the smell of smoke, which I figured was someone burning leaves in the neighbourhood. Finally looked down and there was a circle of red smouldering grass about 3 feet across around the bottom of my ladder. Lucky it didn't catch on fire.