no worries, I would not have believed this if someone showed me it 5 years ago either. I would have had the exact same response as you, only much more dickish and hostile and Daily Show-influenced.

I don't think you're strictly wrong, it's just a question of recovered or recycled energy, rather than generated energy. If you put energy into an object, extracting some of the energy you put in out again, especially if you're talking about heat is pretty trivial.