Fishermen off Australia's southern coast thought they were in for a quiet day on the water — until a massive great white shark showed up and started behaving, as one man put it, "like a big puppy." The encounter, which has since grabbed attention online, happened near Anglesea, Victoria. According to the Geelong Advertiser, long-time fishermen Kevin McLoughlin and Shane Lockyer spotted the shark swimming directly beneath their boat. Not circling…