Most people rarely lie and therefore operate with a "truth bias," assuming others are also being truthful. This cognitive default, while efficient for most interactions, becomes a major vulnerability that people with dark personality traits exploit. They can lie frequently because it rarely occurs to others to question them.

When you are insulted, onlookers look to your reaction to determine if the insult is true. Responding with laughter or nonchalance signals that the attack has no merit, effectively invalidating it. An emotional or defensive reaction, however, can give the insult credibility.

When a man shares a truth that upsets a woman, she often reacts with displeasure, believing her emotional response will compel him to change his reality. Instead, it teaches him that telling the truth is not worth the negative consequences, effectively training him to withhold information in the future.

People who are lying or manipulating want you to get angry because it creates chaos and distracts from their deception. They fear a calm, controlled response because it allows for scrutiny and highlights their unreasonableness, taking away their power.

There is no single giveaway for lying that applies to everyone. The key is to first understand an individual's normal pattern of speech and behavior (their baseline). Deception is revealed through deviations from this norm, such as adding excessive, unnecessary details to a story to bolster its credibility.

According to "Truth Default Theory," telling the truth is our natural, low-effort state. Lying is cognitively demanding as it requires inventing and tracking a false narrative, which violates the human tendency toward cognitive ease.

When trying to deceive someone, admitting a genuine, less critical flaw can make you seem honest and self-aware. This vulnerability makes the primary lie more credible because the listener thinks, "Why would they tell me this bad thing if the other part wasn't true?"

Contrary to the idea that only criticisms we believe are true can hurt us, the most painful ones are those we know are false but fear others will accept as truth. This trifecta of indignation at the lie, the pain of misrepresentation, and fear of public perception is what truly stings.

To check your integrity, imagine your conversation is on speakerphone for all stakeholders to hear. If you feel the need to change your words or ask to be taken off speaker, you are likely changing the core message, not just adapting your style.