Thirteen-year-old rappers Chris "Daddy Mack" Smith and Chris "Mack Daddy" Kelly became the pop sensations of 1992 as Kris Kross. The two were discovered at an Atlanta mall in 1991 by then-19-year-old producer Jermaine Dupri, who took them under his wing and came up with the gimmick of having the duo wear all of their clothing backwards, lending more significance to their name. Thanks in part to savvy marketing, "Jump," which sampled the Jackson 5's "I Want You Back," became the fastest-selling single in 15 years, staying at number one for eight weeks on the Billboard charts an...