Alex de Angelis experienced the wrath of Nicky Hayden and Colin Edwards after bringing the two Americans down in a clumsy turn two clash at his home San Marino Grand Prix on Sunday.
Carrying speed around the outside of the right-hand first turn, de Angelis then slammed into the side of Edwards as the field formed a bottleneck for the left-hand second turn.
Edwards knocked into the back wheel of title contender Jorge Lorenzo as he fell, before Hayden was dragged from his Ducati and Randy de Puniet was forced off track.
The accident marked the first time that de Angelis and Edwards had failed to finish a race this year, and cost Edwards fifth place in the world championship to Andrea Dovizioso.
"I thought I had the pace to easily be fourth and maybe fight with Pedrosa for a podium but we are in Italy and occasionally you have to deal with an Italian rider who wants to be a hero and today that was de Angelis,” began Edwards.
“Turn one at the start with 17 bikes is not the place to be going at race pace and he was never going to make through there. Today de Angelis is the guy who needed to be wearing Valentino's donkey helmet.
“I didn't know what happened until I was sliding through the gravel. Turn one is the most dangerous time to crash with so many bikes around you, it is unacceptable.
"I've been fighting with Dovizioso in the championship most of the season and now he has ten points on me with four races to go... That's racing,” concluded the Texan.
A furious Hayden made his feelings clear to de Angelis as the dust settled in the gravel trap, and was still seething after returning to the pits.