My favorite part is how the cashier at a Mannings/Watsons/similar in the hinterlands (outside the "cosmopolitan" bits of HK) will often ignore spoken instructions to give you a bag, ring up your purchases, offer you some sort of bulky "free gift"/"special offer" crap while doing so (never thinking that you might need a bag to carry any of this stuff away), and then pull an attitude when you remind them that you need a bag and they have to add the cost of a bag onto the transaction and actually bag your stuff.