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[–] 5 points 4 months ago (1 child)

An electromagnet with no waterproofing. Stick it in water, it shorts out, once it dries out it starts working again.

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  • [–] 1 point 4 months ago

    That's fine but it would be better if a partially submerged device also functioned partially. And I said material specifically because it's lame if it needs power.

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