How many movies have Baat Leung-Gam and Nelson Ngai Tak-Lai acted in together?

They have worked on 3 movies together! Their first movie together was S.D.U. - Mission in Mission (1994) while their highest rated movie together was Teaching Sucks (1997). They have not worked together since Troublesome Night 17 (2002). They are most known for their comedy films together.