I walked into this Bangladeshi spaza shop yesterday, in a township, in the midst of an angry row. I asked people what was up. A youth had (he said) tendered R200 to the shopkeeper. The shopkeeper had (he said) received R20 from the youth. The notes are similar. Afterwards, when I shared this story, I was told: "It's a common scam. People do it all the time, to extort money from shopkeepers." OBSERVATION: I was troubled, though, by threats against the shopkeeper.