Well assuming the Bic lighter in my right front pocket malfunctions or doesn't work, there is the magnesium bar that is always on my keychain in my left front pocket that has an embedded flint. And then I have at least two different blades on my person to strike the flint with.

If somehow I end up in the woods completely naked, it's not too hard to come up with the components for a wood block & drill, using a bit of vine for the bow. Assuming I'm not buck naked, I can use the lace from my boot. But if I'm not buck naked, I've got multiple firestarting devices on me everywhere I go anyway.