There are certain things you intuitively know, without learning or hearing about it, you just know. You also know this information without knowing how or why. This knowledge you sense is inherent, something you know without any external sources having to tell you.
A common test for this instinct is by looking a two images of two different people who are laughing.
Most can instantly detect without knowing the reason why, which laugh is genuine and the other is just laughing on cue, much like an actor for a photo …