The moment when Alain Prost (FRA) decided not to leave the door open to allow his McLaren MP4/5 team mate Ayrton Senna (BRA) through at the entrance to the chicane. They collided. Prost retired on the spot, Senna was push started and recovered to win, but was disqualified.
Formula One World Championship, Rd15, Japanese Grand Prix, Suzuka, Japan. 22 Oct 1989.