2. Touching the nose. Scientists have found that lying can cause the tissue in the nose to swell, meaning that a quick stroke could be a sign of deceit (or that it's allergy season).
3. Rubbing an eye. When lying to someone, the instinct is to look away in shame. Since that's a dead giveaway, many people content themselves with a fast wipe of the peepers.
4. Touching an ear. Just as you're supposed to see no evil, you should hear no evil as well. These nervous gestures can range from a small rub of the back of the ear to an outright yank of the ear lobe.
5. Going for the neck. Research has found lying can cause a tingling in the tissues of the neck, leading to scratching or pulling the collar. It signals that the speaker is feeling uncertainty, so be concerned if you see it right after your sweetie announces, "Of course this Prada dress was on the sales rack at Marshalls."
6. Shaking the head no while saying yes. If he says, "Yep, I'm getting home late because I have a big assignment to finish" while nodding his head, he's working late. If he sends the mixed message of saying yes while shaking his head no, look for him at the Spearmint Rhino (read: strip club).