Sorry to go off topic, although it kind of shines a light on 'Thaism'.
I shopped at Makro for the first time today. The cheeky swines insisted on scanning my receipt and matching it to my trolley contents. I asked to speak with the manager to convey my utter disgust at such behaviour, they had sought to intimidate me, in a way, suspecting that I had stolen something. The manager was at lunch, lucky for them, I had a few choice words for them. I will stick with Big C from now on. If they tried this tactic in Europe or the US, they'd have no customers, people like me would never return.