I think 上海滩 (Shanghai Bund, the TV series) when I see this, and the image of a young Chow Yun-Fat brandishing a gun looking all gangster-ish.
The voice of Francis ‘power lungs’ Yip would sneak up and inadvertently ricochets in my head to start a hum of the theme song of the famous 1980 Hong Kong TV series that pinned my parents to the edge of their seats every Saturday and Sundays evenings for months. Little me joined in.
That is why I understand Cantonese. After watching it a few times over – it was that riveting in the 80s.