Creek! That is cool. It's kind of like the fire chain. You can see that post in my submission for the FFF.
Build a bowdrill with what you find in the woods, light a natural tinder bundle (materials found on site...), start a fire. Use that fire to char some natural material found on site (I used punk wood), ignite the char with flint and steel, start another a tinder bundle using material found on site... It's a real pain in the ass....