General Mills introduced two new cereals in 1971, Count Chocula and Franken Berry. Like Lucky Charms, they were cereals studded with colored marshmallows, super-sweetened to appeal to children. Both cereals were an immediate hit, and even today show up in grocery aisles around Halloween. Some kids noticed a side effect of eating Franken Berry right away, that it made your poop bright pink. Parents were shocked, and some took their children to a doctor or even an emergency room to check for internal bleeding. The condition soon earned its own name: "Franken Berry Stool." Read about the panic and what the cereal maker did about it at Atlas Obscura.
(Image credit: Flickr user GeneralMills)
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