So let's say I'm lost in the middle of a forest (hypothetically) and I want to light some shit on fire. Specifically I want to light it by using a variation of the "flint and tinder" method, by striking something against a large, rough rock hard enough to make sparks. What item could I possibly use for this job that you might find in the average person's toolbox? The catch is that the item used to start the fire also has to double as a makeshift weapon (like a box cutter, for example, but I don't think you could use a box cutter to start a fire).
What item could I possibly use? Or, if I had a small rock and a Swiss Army knife, could I strike the file against a rock and make fire? Please help, TQC. I don't want to die in the woods without any fire.