Rice Krispies (known as Rice Bubbles in Australia and New Zealand) is a breakfast cereal that was created by Clayton Rindlisbacher for the Kellogg company, and later marketed by Kellogg’s in 1927 and released to the public in 1928. Rice Krispies are made of crisped rice (rice and sugar paste that is formed into rice shapes or “berries”, cooked, dried and toasted), and expand forming very thin and hollowed out walls that are crunchy and crisp. When the cereal is subjected to a change in heat, the walls tend to collapse, creating the famous “Snap, crackle and pop” sounds.
Rice Krispies cereal is widely known and popular with a long advertising history, with the elfin cartoon characters Snap, Crackle, and Pop touting the brand. In 1963, The Rolling Stones recorded a short song for a Rice Krispies television advertisement.
Info gleaned from Wikipedia