Oh I have - just watch a tyro use one to buck up or cut wood lying on the ground and have a few rocks in the dirt. they saw right through the wood into the dirt and hit a few rocks and it sparks nice.. dulls the chain to bits too.. (as I recall catching H E double toothpicks from my father while learning to clear trail with a saw and letting the bar get in the dirt)

Do that with a little bit of foxtail barley fluff on the ground when it's dry - you'll have a fire.