Averting your eyes.

Remember, it is always difficult for a liar to look straight into the eyes. But when a person looks away, it's too obvious... something smells fishy. Therefore, when lying, people have unintentionally invented disguised gestures such as rubbing their eyelids, as if something itches. Naturally, I'm not saying that everyone who rubs their eyes is necessarily lying. But if the person is simultaneously answering questions, then I recommend taking a closer look.