JANET JACKSON/JUSTIN TIMBERLAKE (2004)

The halftime show started modestly enough — Jessica Simpson, a couple of college marching bands, Janet Jackson, P. Diddy, Nelly, and Kid Rock all took the stage. But when Jackson returned for an encore, Justin Timberlake appeared for a duet of his hit ''Rock Your Body.'' Before most viewers knew what was happening, the former boy-bander ripped away her bustier, revealing her breast for a mere second. The most entertaining part of this performance may just have come after it was all over, as the media firestorm around the indecent exposure raged on for months.