I read about using Gallium spoons to mess with science students in a book yesterday. Apparently you can buy your own at disappearingspoons.com. I'd be worried about someone drinking one. But it sounds as though ingesting gallium might not be as dangerous as say, a spoon of mercury.
While we were enjoying the spoon video, we noticed this video of mercury eating into aluminum. Fun to watch (and short - they compressed the two hours to 40 seconds).
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