In my youth, I was working a construction job at a commercial laundry. We had to install some new steam piping to an existing very large clothes dryer. I had my torch running to cut the existing pipe when it moved slightly and came in contact with some of the lint covering the inside of the dryer. I can't even begin to describe how quickly and intensely it roared into eight foot plus flames. Although the fire was over nearly as rapidly as it began when the lint was fully burned, I fully appreciated the seriousness of what just happened. I look at this scene, with everything covered in fine lint and with the building constructed of wood, and can visualize how quickly it would become a raging inferno with just a small spark/flame. Scary!

Now I know where all those Santa Beards come from.