Completely serious and very handy. On your next fishing trip, when you realize you once again forgot to bring water-resistant matches, try it. I did.
We did our trout-a-la-hood recipe (river trout, onions and herbs covered in tin foil, and placed under the hood) on my last camping trip, and a friend of mine who enjoys road-trips, puts whole heads of garlic (again, tin foiled to a tee) near the radiator head. After a full day of driving, he enoys his "baked" gralic on fire-grilled bread.