Pretty cool! A can of Wood's Navy Rum would be even more useful, though. You could use it to aid in the ignition, and drink from it to keep warm while waiting.

Umm. I've never seen it sold in cans, though...

That looks like fun!

Being pedantic I suppose you do also require the sun in order to start the fire. But I guess that "Making fire with a can of coke, a chocolate bar and 5500 deg.C, 2x10^30 kilo heat source." doesn't sound quite as impressive. ;o)

I suspect that if you had a 5500 deg.C heat source on your person, you wouldn't need the coke can and the chocolate bar to make fire ;-)