What's in a perfect smile? In Shanghai, it's 6 to 8 teeth They say a smile can take you a long way. Communications professionals believe it increases your face value and works magic, leading to more success, financially and socially. So we should never underestimate its power. But not just any smile will do. Organisers of this year's Shanghai World Expo are pulling out all the stops to make the six-month event a reverberating success from head to toe, including putting on a perfect smile. The expo has already recruited tens of thousands of volunteers to welcome visitors in May, while a citywide project to teach a million families better manners has been in progress since 2005. Now etiquette coaches are in the final stages of producing an army of smile ambassadors to display a friendly and civilised Shanghai to the world. These ambassadors have gone through some intensive smile training. We hear the goal is not just an ordinary conservative smile without showing the teeth, which was required by etiquette in ancient China. No, an ideal expo smile should show six to eight teeth, depending on the size of the mouth. It's not easy to control precisely the extent of your smile, so a big part of the training involves practising with a chopstick, which trainees are required to bite on for hours to 'calibrate' their smiles. Smiling is all about showing appreciation from the bottom of the heart. You can teach people to smile, of course, but no amount of coaching can produce a genuine smile. Donation sounds nobler Denway Motors, the Chinese partner of Honda Motor, has been criticised for 'donating' more than 300 million yuan (HK$341.04 million) to this year's Asian Games in Guangzhou. Market reports say the carmaker's drop in sales and a 'one-time charitable donation' contributed to its net income shrinking 8.6 per cent to 1.91 billion yuan last year. It's believed the donation 'was unexpected by the market'. But Denway argued that it's only a straightforward sponsorship. Lai See thinks it has a better ring to it as a donation, because it gives the impression that the company has sacrificed profits for a noble cause. Good omen We hear the Jockey Club has been trying to ramp up excitement over rugby. It reminded punters at Sha Tin Racecourse on Sunday that it's Sevens week. Final preparations for this weekend's Cathay Pacific/Credit Suisse Hong Kong Sevens are in full swing, but a different form of 'rugby' stole the thunder at Sunday's race meeting. The first race of the afternoon was, believe it or not, won by Rugby Heaven, owned by a team of 11 guys who go by the name of Rugby Syndicate, managed by Trevor Gregory and Brian Stevenson, chairman and president, respectively, of the Hong Kong Rugby Football Union. Stevenson is also deputy chairman of the Hong Kong Jockey Club. A Jockey Club insider said it was Rugby Heaven's first win ... and no doubt a good omen for the upcoming Sevens. The horse was bred in Australia and ridden by South African Douglas Whyte - possibly a good sign for these two rugby teams. Lai See has no doubt it will be another Sevens Heaven for rugby this weekend at the Hong Kong Stadium. Mingling for charity Some Hollywood superstars put their egos on parade to save the planet on Earth Day yesterday. According to Christie's Green Auction, a group of Hollywood celebrities agreed to lend their star power to raise funds for its 'A Bid to Save the Earth' campaign next month. We think it's more the other way around; the event seems to help massage their massive egos. Still, we are deeply touched by Hollywood's kindness. David Duchovny is auctioning the chance to have lunch with him on the set of Californication, Hugh Jackman is auctioning off the chance to spend the day on the set of Reel Steel with him this summer, while Sigourney Weaver will let the successful bidder accompany her to a private screening of Avatar. Double standard A reader has offered Lai See some words of wisdom about business ethics. 'When a boss rips off his employees and clients, he is regarded as a shrewd businessman. But when his senior guy does the same, he is a crook.'