They usually meet at mid-night around Po Lam (some of the food stores open until 3:00 am). Then, they ride their bicycles on the road (not the path....) ........... turn on their Hi-Fi (loudly), they shout loudly when riding.......!!!!!
Once, I almost 'crush' one of them.
They ride quickly (around 30km/hr) from a path to the maid road (Po Lam North Road). Their trific light was red, and my direction (Po Lam North Road) was green. They never stop in front of the trafic light (red) and turn 90 degree onto Po Lam North Road. I almost 'crush' on that bicycle .....
I drived around 50km/hour, and he just less then 1m in front of me when I stopped my car .........
His other friends were excited (followed him)......... and it seems that he was a 'hero' as he can do that!!!!!