The significance depends on the details and the action in the dream. If the dream involved many cans and they were full, you can likely expect some good news to reach you quite soon. If you opened a full can, you may discover some very useful secret knowledge; if you drank from a can, you could soon have unanticipated joy. However, if the can featured in your dream was empty or discarded, or if you threw it away or cut yourself on it, you may have serious financial difficulties ahead. Reexamine your plans for an alternate road.