T5-R
Well I was a bit young then to remember that
Here's what happened (briefly):
Title fight in the 1990 season (between Alain Prost, then driving for Ferrari and Ayrton Senna, then driving for McLaren) went down to the final race of the season at Suzuka.
Senna qualified on pole (as he usually did during his reign) and Prost was second. Ayrton wasn't happy because Pole Position was on the "dirty" side of the track meaning he'd have a tangiable disadvantage at the start (ie. Prost would jump him because he was starting from the "clean" side of the track).
Senna tried, before the start of the race, to have Pole Position moved to the other side of the track and thus nullify Prost's advantage. He was unsuccessful.
Come the start, Prost, of course, got the jump on him and led into the first corner. Senna being Senna decided to ram Prost from behind at over 200kp/h, taking both of them off the track and handing the title to Senna.
Although he won the title that day, no no-one from McLaren (barring Ron Dennis, I think) congratulated him at all (and rightly so!).
In all, a deplorable piece of driving. It annoys me that Michael Schumacher's "incident" at Jerez 1997 (where he unsuccessfully tried to ram Jacques Villenevue off the road in order to win the title that year) was penalised so heavily, especially considering he failed (but was penalised anyway).