A strange Hong Kong movie from 2004, "Where is Mama's Boy?" has a plot involving a long-lost son, a gambling/"entertainment parlor" and a good amount of poorly-done 'wire-fu'.
Oh yeah, and songs. Some really bad Cantonese songs are sung repeatedly, but William Hung (who seems to be the reason why this movie was made) steals the show with his performance of a song about "Shaobing", a kind of Chinese pancake.
The HK DVD has some English subtitle problems, which I think contribute to the confusing plot. I'd recommend avoiding this stinker, but if you can find it for $19HKD (2.25USD), it might be worth the purchase, just for the camp value.
