Coca - cola assault on Pepsi has often beendirect and aggressive ,During the 1989 Super Bowl ,as part of its "the move is on" campaign ,Coke ran ads claiming that one-quarter of the 2 million families that had stopped drinking pepsi in 1998 had Switched to diet coke pepsi responded with ads Claiming that go percent of those people eventually switched back to pepsi , and coke ended up revising its ads. Pepsi also used its commerciols to make fun of how Coke came up with its number and while Coke had exclusive rights to the Supper Bowl ,Pepsi reduced the offects of this monopoly .somewhat by having Diet Pepsi sponsor a pre-game show staning NFL players