Cocoa Pebbles is a breakfast cereal introduced by Post Cereals in 1971, featuring characters from the animated series The Flintstones. It contains chocolate-flavored crispy rice cereal bits. A similarly-themed cereal is Fruity Pebbles. Unlike its sister cereal which has undergone many formula additions and variants over the years, Cocoa Pebbles has remained essentially the same product, except for the addition of polydextrose in 2006. The classic television commercials for both Pebbles cereals had a recurring theme: Barney Rubble attempts to trick Fred Flintstone out of his cereal, or to simply steal it outright. Barney was often in disguise in these attempts, and sometimes, he pulled off his gag with some help from Dino. In protest of the swiping of his breakfast, Fred customarily shouted, 'Barney, my Pebbles!' and gave chase.