The Monkey's Paw and other Magic Items

It dawned on me the other day that W.W. Jacobs' "The Monkey's Paw" represents the ideal example magic item for LotFP.  This little item (an enchanted, mummified ape's hand) represents almost unlimited power to the owner, but at the same time is a promise of untold calamity if used. 

In the original story, the couple who come into possession of the Paw wish for cash - resulting in their son dying in a horrible machining accident, and the family receiving a stipend equal to the amount they wished for.  They wished him back to life, and he returned -- not only horribly mangled by the machine, but with a week's worth of decay as well.  Finally, they have to wish him back into the grave, and are left only with the sorrow of his passing and the recognition that Man cannot alter his fate.

What are some other ideas for LotFP Magic Items? The only other good idea that's coming to my mind right now is an amulet that keeps monsters away...by virtue of being dangerously radioactive.