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"Unusually strong neodymium magnets" were a popular young-adult toy in the late 2000s to early 2010s. I had them both in flat discs and little balls.

Now that I have a baby crawling around I pray that I haven't misplaced any in some crevice of the house...

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They were also a part of rotating rust drives, which made it very fun to find old ones and pick them apart.

Wait. What will they do to babies?!

If someone swallows more than one, they can pinch together different parts of the intestine or bowl and cause a perforation, which is a serious medical emergency that if untreated will lead to death.

It's dangerous for anyone, but babies and toddlers are most likely to actually swallow them.

It's the only example I know of where swallowing one thing is totally harmless, but swallowing a second one is really seriously dangerous.

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