1. Making claims that could apply to anyone
Bertram Forer was a psychologist who gave his students a test, saying it would help him create a personality profile for each of them. Secretly, he gave every student the exact same profile, regardless of their answers, and asked them to rate how accurate they thought it was. The majority of the students said it was right on-the-mark. In another example of the study, students were given two profiles, one real, another fake—most thought the fake profile was the real one.
If you look back at those statements in the intro, not only are they actually pretty vague, but they can apply to almost anyone, like Sergio! They're also, for the most part, positive; a few negative traits are sprinkled in to make it believable, but none of them are so terrible that you would immediately reject them. Miss Cleo never told anyone, "Honey, I'm getting a real strong feeling that you murder puppies and wear socks and sandals at the same time." No one wants to hear they're a monster.