Former world champion Lewis Hamilton crashed out of the Canadian Grand Prix after colliding with McLaren teammate Jenson Button after just eight laps of Sunday's rain-hit race.
Hamilton came off worst when he tried - and failed - to go up the inside of his fellow Briton.
"What's he doing?" complained Button over the team radio as the safety car was summoned onto the track.
It was a second successive controversial race for the 26-year-old Hamilton.
At the Monaco Grand Prix two weeks ago, the Englishman was penalised for collisions with Felipe Massa of Ferrari and Pastor Maldonado of Williams.
Afterwards he criticised the stewards in an outburst during a television interview, in which he jokingly suggested, with a reference to the comic character Ali G, that he was being victimised because he was black.
He apologised to the stewards in Monte Carlo and wrote a letter of apology to the FIA.