Don't click play on this video yet or you'll ruin the surprise! First, try this quick test to find out if you're an expert at deception or not.
Quick, draw a capital Q on your forehead.... Now you can read on or watch the video.
University of Hertfordshire psychology professor Richard Wiseman says in the video above that the direction you draw the Q can reveal if you're a good liar or not -- and, interestingly enough, whether you're an extrovert or an introvert.
You can take the test with a big grain of salt, since undoubtedly many introverts are adept at lying. The way you chose to draw the Q, however, could say something about your perspective.