I heard if you shake the drives hard enough all of the magnetic bits that are standing up (perpendicular recording) will fall over.
Seriously though, you would need to be excessively paranoid, or some sort of spook in fear of his life, to be THAT worried about data destruction. Remove the 5 or so screws that are securing the lid (one or more may be hidden under labels), remove lid, hit innards with a hammer. If you're really keen you should be able to remove the individual platters to give them some extra attention.
It doesn't matter if the NSA "could" retrieve 5% of your data from the mangled mess, the question is "why would they need to?"
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