If I manufactured toys I'd definitely make 1 in 10,000 toys randomly go off just to mess with people.
You might like the story of the Evil Stick: https://www.mentalfloss.com/fun/toys/evilstick-gruesome-toy-...
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You might like the story of the Evil Stick: https://www.mentalfloss.com/fun/toys/evilstick-gruesome-toy-...