Sunday 2nd June 1991

Nigel Mansell decided to wave to his fans during the last lap of the 1991 Canadian Grand Prix as he cruised to what seemed to become yet another dominant win. But as the electronic brain of his Williams-Renault got confused as to why the driver would want to drop the revs below the recommended level and disengaged the clutch. Nelson Piquet sped past the frustrated Englishman to score what would turn out to be Piquet’s last ever victory in Formula 1.