Shark repellent...
....hadn't heard of this before:
Some of the earliest research on shark repellents took place during the Second World War when military services sought to minimize the risk to stranded aviators and sailors in the water. Studies at the time, combined with historical research, revealed that about the only thing that will drive sharks away is the odor of another dead shark. Efforts were made to isolate the active principles in dead shark bodies that repelled other sharks. Eventually, it was determined that certain copper compounds, such as copper sulfate[citation needed] and copper acetate ,[4] in combination with other ingredients, could mimic a dead shark and drive live sharks away from human beings in the water. For years, a combination of copper acetate and a black dye to obscure the user was supplied to sailors and aviators of the United States Navy as a shark repellent. Known as "Shark Chaser," it was first packaged in cake form using a water soluble wax binder and rigged to life vests. The Navy employed Shark Chaser extensively between 1943 and 1973. It is believed[4] that the composition does repel sharks in some situations, but not in all, with about a 70% effectiveness rating.
http://en.wikipedia.org/wiki/Shark_repellent
Personally, I would have thrown in that mouthy posh cow.
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