It's that time again. Every so often, over the past 20 years or so, some group of young British men got involved in a fracas, at or near a football match. Chairs were thrown, blood was spilled, cameras whirred and the telephones of sociologists and other researchers began to ring. The question, whether it came from the Daily Mail, Radio Humberside or Richard and Judy, was always the same: "Are we seeing a return to the bad old days of football hooliganism?" On Sunday, agitated Cardiff City supporters invaded the Ninian Park pitch following Cardiff's FA Cup defeat of Leeds United. On Wednesday night missiles were thrown at players during the Worthington Cup tie between Chelsea and Tottenham Hotspur and the same thing happened at Millwall last night. "I've never known anything like this before in England," Chelsea physiotherapist Mike Banks told the Evening Standard. So the question is back on every news editor's lips: "Has British football failed to learn the lessons of Heysel, Hillsborough and the 1980s?" When it was put to me, having scratched my head, my response was: "What lessons?"