Coins
rbos, 
Sounds like a Bunny Suicide
fosforus, (edited ) This comic brings me hope. That some day, if I work really hard, I might be a web comic artist as well.
x4740N, 
Wouldn’t the coins also potentially become deadly projectiles
Soap10116, Do it with nails. (Most) Nails are made of steel. You likely won’t make it anywhere near the MRI bed before they start doing their thing though
badbytes, Ferromagnetic marble would be easier to swallow.
Soap10116, Oh, I’m going for damage.
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