I recall 8-10 years ago, this was a thing, they used the term guerrilla marketing back then.
I saw a bit about people dressing like tourist couples in NYC and asking random people ( in their target group I’m sure ) if they could take a picture of them together. They were in reality doing product demos and live commercials for the camera industry, I don’t think the manufacturer hired them, it was probably a local store. A bit fuzzy on the details, sorry.
