On This NLP Hypnosis video, Derren Brown shows how one can trick someone's mind to believe that something is okay, while it's not. In this example he is paying with plain paper instead of actual money

The trick is First to make report, then to confuse someone in such a way that he is in need for some comforting and reassuring words and actions

In this example: first some kind words " this is a fantastic place". Then a distracting story about the subway and directions "I was a bit intimidated about this place and how to find it". An at last some reassuring words "It's okay, take it, it's fine" exactly while handing over the supposed money