BBC Sport's Adrian Warner believes that bad behaviour by the crowd at the London Double Header is a warning for organisers of the 2012 Olympics.
"Olympic organisers have a big lesson to learn from some some chaotic crowd scenes which I experienced at Twickenham at the opening of the new domestic rugby season at the weekend.
"Having stopped people from taking drink cans into the stadium, presumably because they could be used as missiles, the bars still sold plastic bottles of coke and cider to spectators. Sounds harmless? Well, far from it when the bottles are flying into your face and landing on your children from a great height.
"In the second half of the Wasps-Harlequins game, the crowd got carried away with a Mexican wave and starting throwing anything they could find into the air; bottles, cups and cardboard beer glass holders."