When I was a kid, we knew some brothers who must've been pyromaniacs: they regularly set fire to the farmer's fields over back of us and one day, after they'd bragged they could light a fire anywhere, someone told them they couldn't light one in the middle of the stream where we often spent time.
They rose to the challenge: building a raft, piling it with brushwood then setting fire to it in mid-stream.
__________________
|