Rice Krispies Treats Cereal
Peak Popularity: Late 1990s
This was the tastiest cereal ever made, a perfect hybrid of cereal and warm, gooey rice crispy treats. It even turned your milk in the a wonderful sea of marshmallowy-goodness.
But, the greatest trick RKT cereal ever pulled was convincing people it no longer existed. Apparently, there's a box or two on a gas station shelf in North Dakota. But until we see it, we'll assume its amazing flavor was lost to the sands of time.