mmmmmm, dehydrated marshmallows. I used to eat up all the crunchy (boring) bits of cereal just as fast as I could, so that I could eat all the marshmallows at once. If I was juuuust gluttonous enough, they would still be a little Styrofoam-esque by then.
I'm gonna nominate
Corn Pops and
Fruity Pebbles since they're the only gluten-free ones I can ever find that don't cost astronomical amounts of money for a smaller-than-standard-sized box, and therefore are always in my house.