This punk should not be that hard to spot. An armed robber in a clown mask looted a Dunkin Donuts in the South Loop early Thursday, police said. An employee was working alone at the Dunkin Donuts at 1575 S. Michigan Ave. when someone in a green coat, green pants and a clown mask entered through the store's front door and displayed a handgun about 1:50 a.m. Thursday, according to the Chicago Police Department. The robber ordered the employee to open a cash register. At that point, police said, the robber took an entire drawer and an unknown amount of cash before running out the back door. No injuries were reported.