It was as if someone had poured tons of coffee and milk into the ocean, then switched on a giant blender. Suddenly the shoreline north of Sydney were transformed into the Cappuccino Coast. Foam swallowed an entire beach and half the nearby buildings, including the local lifeguards' centre, in a freak display of nature at Yamba in New South Wales. One minute a group of teenage surfers were waiting to catch a wave, the next they were swallowed up in a giant bubble bath. The foam was so light that they could puff it out of their hands and watch...