Make Fire with Your Own Fat

I have pondered the inability of the contestants on Survivor to make fire. I gather using friction to make fire is quite difficult. Flint and steel might work if you have flint: in short supply on desert islands. I wonder if a fire might be started using spontaneous combusion: actually ex vivo spontanoeus human combustion.

Oily rags can spontaneously combust if stored in an area where oxygen can get to them, oxidizing and heating the rags, but in a tight space so that the heat can accumulate, reaching ignition temperature of the rags. In principle, any oil or grease should work for this.

As with most Internet users, I have a generous pendulous pannus of fat which I keep in case of famine. Anyone who has watched a surgery knows that much of this fat is right under the skin. It should be accessible with not much bleeding using a swiss army knife.

I propose a fire making technique in which cotton briefs are saturated with warm human grease obtained as above, then stuffed into a shoe. A hole is bored in the tip of the shoe and air is sucked in by the firestarter, like vigorous smoking a pipe. The flow of air down through the greasy rags in the confines of the shoe should oxidize the grease, and the small area of the shoe capture the heat, allowing for spontaneous combustion and the creation of fire. Fast moving might even allow the fire to be removed from the shoe before it is burned up.

[World], if you test this out and post video I will replace your burnt underwear with a new pair of your choosing. Even that gold lamee pair you have been craving! You can use lard if the fat harvest thing makes you squeamish. You can use a vacuum cleaner to suck the shoe, or your robotic bongsmoker if it is still working.