By 1993, when this exposition kart race happened, the epic rivalry between Ayrton Senna and Alain Prost had mostly peaked. But the fiercest rivals the sport had ever known did take their karting seriously. Check out the technique.
Prost had returned from a season off in 1992 to win the driver's and constructors' championship at Williams-Renault in '93. But when he found out he'd be teammates again with Senna at Williams in '94, Prost chose to retire.
We may never know if the two ever reconciled personally, but Prost was a pallbearer at Senna's funeral in 1994.