2008 Singapore Grand Prix
Renault ordered Piquet to crash his car during the 
, which he did. This benefited team-mate Fernando Alonso's race strategy, and he went on to win the event. After being fired midway through the current season, Piquet told the FIA, who oversee F1, that the team had been cheating.
Coulthard says Piquet should have been punished for F1 cheating