Picture it: it's Saturday morning, you awake to a beautiful sunshine day, you hop out of bed and go to the kitchen. You get out a new box of cereal and remove the bag from the box so you can get that Chinese knockoff toy thing, but your sibling already took it, so you put the box over your head and beat them sideways with the bag until they bleed frootloop red. Then you claim the product of a tortured soul for yourself because you deserve it.
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More likely something to do with the toy industry. Besides most the toys in cereal box's break fast and someone ends up choking on the parts or your pet does. While I did enjoy them when I was young, now days I could careless. I wouldn't also put the reason past these health nut parents wanting their children to eat healthy cereal and not having to hear their child scream and bitch that they're not getting the cereal that comes with the toy.