A guy came to the door at work a few years ago offering to install magnets on all of the gas lines feeding our ovens in order to make drastic reductions in our gas consumption.
He skipped past the "science bit" and went straight to the practical demonstration, showing us how a disposable lighter flame got hotter when he put a magnet round the lighter (and then held it a bit closer to your hand than before).
Strangely, he didn't get an order
