OK, so this hack requires a little capital investment. Nothing major, but you will have to spend a little money. Go to your local hardware store and buy a piece of galvanized cable that is long enough to loop through your helmet’s chin bar with a few inches to spare. Buy crush sleeves and form loops at both ends of the cable. When you get ready to leave your bike parked, simply loop the wire through the helmet and lock it to that impossible-to-use helmet lock on your bike or loop it over the latch for your seat. This isn’t fool-proof, but it will keep the honest people honest.