摘要：I nvasions of sports fields by large numbers of 'fans' seem to have become more common in recent times. The crowds are mostly amiable but sometimes there is aggressive behaviour towards the players and umpires. As well as posing some threat to players, umpires and security personnel, pitch invasions occurring during the course of an event spoil the entertainment for other fans. These invasions of cricket ovals or football fields should be distinguished from transgressions by individual spectators who mostly appear to be driven by exhibitionist tendencies. I argue that the two behaviours are quite different and should be handled differently
