Cheers HKfella and elle,
elle, Yes I've seen that at the HK immigration. Many many time have I been waiting in a long line of people only to get to the front and hand over my passport when the officials open the barrier separating visitors and HK residents and let everyone behind me go straight to the front of the HK residents section.
Nevermind, what are you going to do?, laugh or cry?
Normally for me it's a bit of both.