Just to inject some Discovery Channel pedantry (that's my new favorite word) into the mix, most shark attacks are not so much "vicious" attacks as they are attempts by very large, instinct-driven eating machines with very sharp teeth to determine if you are edible or not. They're seeing if you're lunch, and once they've determined you're not tasty they'll move on. The vast majority of sharks actually don't like the taste of human and will move on after one strike, unless they're sick, hurt, or in a pack that starts frenzying because of blood in the water.
From the ISAF (International Shark Attack File):
"....the white, tiger and bull sharks are the "Big Three" in the shark attack world because they are large species that are capable of inflicting serious injuries to a victim, are commonly found in areas where humans enter the water, and have teeth designed to shear rather than hold. Realistically, almost any shark in the right size range, roughly six feet (1.8 meters) or greater, is a potential threat to humans because, even if a bite is not intended as a directed feeding attempt on a human, the power of the jaw and tooth morphology can lead to injury." --- George H. Burgess, ISAF
lurkette "swims with sharks" (well, wants to, at least)
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