The Greatest Civil War on Earth (1961)

A Cantonese tailor by the name of Cheung crosses swords with a tailor from Northern China, Li Si Bao over issues of a cultural, material, and social nature. The two have neighboring tailor shops, and sparks immediately begin to fly between the two gentlemen. But when Li's family moves into a neighboring apartment of Cheung's - that even shares the same kitchen, living room and bathroom - the battle really begins!

Unfortunately the movie The Greatest Civil War on Earth is not yet available on HBO Max.