Chances are you've seen, sometime in the past few years, this video going around on social media:
I never could figure out how they did it. But now Dave Hax, the guy who showed you how to draw a perfect circle, reveals how it's done:
Is it me, or is it always a little disappointing when you learn how a magic trick is actually done? I struggled with whether or not to post this one, but decided I am ultimately okay with removing magic from your lives. Don't say you never learn anything here!