As a follow up to this, I am updating to inform you that people do naturally walk in circles!
Six walkers forged through a flat, forested region of Germany. Three trekked through the Sahara desert in southern Tunisia. (A sand storm stopped further testing in the desert). All walkers wore GPS receivers so that the researchers could analyze their routes.XD
The results, published today in the journal Current Biology, showed that no matter how hard people tried to walk in a straight line, they often ended up going in circles without ever realizing that they were crossing their own paths.