Normally I am the opposite of a fearful, timid person. However I once found the instructions for one mystery shop to involve real danger.
This was a multifaceted shop at a very large outdoor flea market, with service in a restaurant to be sampled, and a few specific photos taken. You need to know that the flea market was huge, and the shop had to be on a weekend, when it was extremely busy. Also, I got the feeling that if a customer was hunting for stolen car parts, this would be the place to search.
One of the photos required was inside the men's room. I visited the men's room several times during the hour or so I was at this flea market. Each time there were 20 or more guys in it. What would have happened if I had started taking pictures ? I never took a picture there because I wanted to live.
I explained in the report why there was no interior men's room photo. I never got paid, and will never again sign up for another shop like this one.