Yes, but there is a catch: it only works if your zipper doesn't have a stopper (a small bit that keeps the zipper in place at the bottom). You can fix a broken zipper with a fork by feeding the zipper head through the two middle prongs of the fork, bringing the two halves of the zipper track together, and pushing the zipper head back on to the track. It's a great trick, but be sure to secure your zipper on the track afterwards.