| Director | Ringo Lam, Tsui Hark |
|---|---|
| Box office | $46.9 million |
In 1965, a Hong Kong couple are doting on their newborn identical twin boys. Meanwhile, a dangerous gang leader named Crazy Kung is being transported as a captive in the same hospital. Crazy Kung escapes and attempts to take one of the twins hostage, and in the ensuing chaos the twins are permanently separated. One of the twins, named Ma Yau, is taken to America by his parents and grows up to be a concert pianist and conductor. The other twin, Ma Wan, is found and raised by an alcoholic woman named Tsui, and becomes a street racer and martial artist named Bok Min. For years, neither of them is aware that he has an identical twin brother.
26 years later, the twins' lives intersect again: Bok Min and his best friend Tarzan (Tyson in US version) get mixed up with a dangerous gang, while Ma Yau prepares to conduct a major concert in Hong Kong. In addition, the twins gain romantic interests: Bok Min meets Barbara, a club singer Tarzan (Tyson) is interested in, and Yau becomes acquainted with Tong Sum, a young woman from a respectable family who has a secret passion for fighter types. Eventually, the twins meet and discover that they share a strange connection with each other. As a result, a string of comedic mix-ups ensues when Ma Yau is accidentally enlisted by the gangsters to participate as an escape driver in the liberation of none other than Crazy Kung; Bok Min in turn is forced to conduct Yau's concert (which becomes a smash hit despite him having absolutely no musical talent); and the two of them end up with the other's girl as their respective love interest.
Eventually, things come to a head when the gangsters kidnap Tarzan (Tyson) to make Ma Yau surrender a briefcase meant for Crazy Kung, which Ma Yau had accidentally nabbed. The twins join up to defeat the gang that has turned their lives upside down, and in a showdown in a vehicle testing center Crazy Kung dies in a runaway crash test car. The film ends with the impending double wedding of the twins to their girls and Bok Min's introduction to his real parents, but when Bok Min gets cold feet and Ma Yau goes looking for him, a final gag falls into place when the wedding guests catch the two twins together and are unable to tell them apart.