“How To Spot A Liar And since we are already talking about lying, you must know that there are a number of ways to spot a liar. Among the most obvious are in their smile and through eye contact. Experts would say that a genuine smile is impossible to fake. Everyone knows how to smile for the camera, and perhaps this is also something we use when we greet other people. But a genuine smile is different because the emotion shows in a person’s eyes.”