Law 14 of 48 laws of power by Robert Greene says pose as a friend, work as a spy.
Believe or not, no matter how simple, humble you think you are there is at-least one person in your life who is playing this game with you!
I have come across these serpents again and again before realizing, deciding that they truly exist and are one too many in my world. They maybe scarce in your world (I hope so) but they do exist.
A great warning!