Cook a Burger with Your Tailpipe
Why waste all that heat out your tailpipe when you can cook a burger with it? We've seen an instructable on how to [https://www.instructables.com/id/Cooking...-with-your-car/ cook with your car], but this concept shows a simple device for grilling on the go.
It looks like it's still just an idea, but where else can we harness energy that would otherwise just heat up the air? link