Stephen Chow and Ng Man Tat.
They were a mostly comedic duo and were in like 20 Hong Kong films together. Most here would know them for Shaolin Soccer, their final project together, but they were great together in every one of the films.
Ng died just a few months ago, sadly. He was a real great, genuinely funny and also a very solid dramatic actor - he won an HK Oscar for A Moment of Romance, and deserved it.