Professional gambler Chi Mo-Sai (Yuen Wah) is on a losing streak until he happens upon Ah Wong (Roger Kwok), a waiter at a local diner. In idiot savant-like fashion, Wong has the unerring ability to hear and repeat complex food orders. But Mo-Sai's plan to put the waiter's incredible memory to use at the mahjong tables runs across opposition from the formidable Auntie Fei (Yuen Qiu), Wong's boss and keeper -- and a zealous anti-gambling crusader.