This is a really interesting video - I had no idea there were so many ways to get fire! I was most impressed by the oily rags, I'd heard they could spontaneously combust, but I'd never seen in actually happen. Some of these techniques are very labor intensive but others, like the 9-volt battery and steel wool, were very easy.
https://www.youtube.com/watch?v=CVD5KFB7478&t=1043s