(Sioux Falls, SD) — One man is behind bars for an unusual robbery case in Sioux Falls. The suspect, identified as 42-year-old Christopher McNab, is accused of threating a grocery store manager with a hammer and then throwing eggs at him. It happened yesterday at a store in store in the area of 34th Street and Louise Avenue. McNab is now facing several charges, including robbery and aggravated assault. Authorities say McNab got in through the back of the store and took some items. He also faces a false impersonation charge for allegedly claiming to be a handy man as a way of getting in.