When Coke outbid Pepsi to be the official soft drink of the Wills World Cup, the dimmest wit would have known that Pepsi, a major cricket sponsor worldwide, wouldn't just bow out of the ring as a graceful loser. Its response has been a classic case of "ambush marketing". Consider its guerrilla assaults—a cheeky mix of ingenuity and disdain—that have already taken place and some that are on the cards: