Double Fattiness (1988)

Luk Siu Fung, an owner of a pizzeria, unexpectedly succumbs to a heart attack. However, her spirit was unable to cross over to the other side, thus, she resurrects into the body of a young woman. Afterward, she reunites with her family and tries to convince them that she is alive. Yet, the plot thickens when a woman, unrelated to the family and is physically identical to Siu Fung, appears, and Siu Fung's husband thinks that that woman is his wife.