I was standing in line, along with others waiting their turn. A woman was berating and abusing the clerk, while we stood there. This woman went off at the clerk as being rude and incompetent, among other things, and the worse person she ever encountered. On and on this woman went, while we waited, Finally, when the woman was done with her verbal attack, she announced to the entire store " oh and by the way, I am a mystery shopper and I intend to report you " .
When I approached the cashier, who was visibly upset , I told her the woman was not a mystery shopper, and that I was, and for several years now. I added that this store doesn't get "shopped" anyway, so do not let her upset her or ruin her day. I added that real mystery shoppers do not announce themselves, nor abuse store workers. I told her that this abusive woman was fulla ^%$#.
This clerk was very relieved and thanked me.