At some point, every one of us has heard this yarn: take a torch and a block of ice, heat a dented piece of bodywork, then apply ice to the center. Supposedly it pops the dent right out, but I’ve never met anyone who claims they pulled it off. I’m contemplating filling a dented motorcycle fuel tank with water and chucking it in the snowbank, but that’s an entirely different principle, and it might be roughly as sane as trekking through the lion pen in flank-steak briefs. Can the contraction from slapping an ice pack on a hot fender straighten it out? Or is it just a way to wind up with a burnt headliner and nothing to cool your beer?