If your circles always end up looking like a deformed eggplant and you don't have a compass nearby, here's a simple trick to drawing a perfect circle with just a pencil and your finger.
Whether you're just doodling or marking out some specs for your next DIY project, sometimes you just need to draw a good circle. This tip basically turns your hand into a makeshift compass. By pressing your ring finger down in the centre of your circle and turning the paper, you can get a much better circle than most of us can draw freehand (though it may take a bit of practice). Check out the video to see it in action.