Well I know the Shark enthusiasts claim that coconuts kill more people so I'm sure that's what you will claim, but I don't believe there is anything factual to base this on. It's one of those common urban myths....
while I have no interest in this question I believe there are far more coconuts around falling out of trees than hungry man eating sharks. I say coconuts
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http://www.straightdope.com/columns/020719.html
http://www.starpulse.com/news/index.php/2006/04/30/rolling_stone_keith_richards_falls_out_o/