To rectify matters here, individual tennis players should be made to wear special, unique colours. Likewise their supporters. And, as at football matches, rival supporters should be kept in different parts of the ground, facing one another. In this way true enmity could develop. Cliff Richards could be brought on, too. But instead of singing "Congratulations", or similar garbage, he should be encouraged to direct a barrage of "You're going home in a fucking wooden box!" at Murray’s supporters opposite. Maybe Katherine Jenkins could be booked to respond in kind with "Shit on Roddick, shit on Roddick today!" for the opposition.
There's opportunity for violent rivalry at up-market restaurants, as well. Everyone knows that vegetarians are unnatural degenerates, but no-one does anything about it. But if, say, Le Gavroche were to pen off a Vegetarians Only area, the morally-sound carnivores would then know their enemy. So, come the end of the evening, post coffee and Cognac, you'd be able to set upon the vegetarians, or wait for them to finish and beat them up outside.
In this way, my life would become a tad more colourful.