If you see some strange off-field antics, you may have stumbled across one of the competing nations' unusual hangover cure rituals.
China: Kudzu (a fast-growing vine with starchy root tubers) is included in a 'morning-after tea', known as xing-jiu-ling, which essentially means 'sober up'. Scientists have found the plant suppresses alcohol's intoxicating effects. In outer Mongolia, men recovering from a big night are known to drain a glass of tomato juice containing a pickled sheep's eye.
France: Twelve raw oysters washed down with a light, cold, white wine. Drink thick, hot onion soup next morning.
Hong Kong: Ginseng tea (lots).
Italy: The ancient Romans favoured owl eggs seasoned with powder from ground amethysts. Italians say 'eating white' - rice, pasta and dairy - is the best option.
Japan: Umeboshi plums, pickled and salted, may be the tartest thing you'll ever taste, but washed down with copious amounts of tea, they do the trick for the Japanese. The pyric acid in ume fruit enhances liver function and helps break down alcohol. Or try raw fish soaked for two days in lemon and raw onion, dipped in hot sauce and eaten with popcorn and beer.
Scotland: Local Scots swear by orange fizzy drink Irn Bru (pronounced Irrrrn Bruuuu), available in Hong Kong. Made in Girders, to gird the loins.