THE ODD COUPLE starring Sammo Hung and Lau Kar Wing. No, not the TV show with Tony Randall and Jack Klugman, nor the American movie with Jack Lemmon and Walter Matthau.
This Kung-Fu classic has some amazing choreography in it, totally master class level! It's pretty cool, Sammo Hung and Lau Kar Wing play these rivaling masters, and as they get older, they want their students to carry on their rivalries. Sammo's student is played by Lau, and Lau's student is played by Sammo!
Old Sammo is a master of spear, and old Lau is a master of Broadsword. So young Sammo learns Broadsword, and young Lau learns Spear!
The opening duel between them is epic, and the rest of the fights in the film are awesome, too. But check out this opening fight scene: