effect How we tend to fall for generalisations

Be aware of fortune tellers, false prophets and the daily horoscope. If we are at it also include religion for that matter.

Barnum effect

The Barnum effect, also called the Forer effect, or less commonly the Barnum-Forer effect, is a common psychological phenomenon whereby individuals give high accuracy ratings to descriptions of their personality that supposedly are tailored specifically to them, that are in fact vague and general enough to apply to a wide range of people.
Definition from Wikipedia – Barnum effect