Employees at a Coventry, Rhode Island, Subway thwarted a would-be robber by ignoring him until he left the store. 

Surveillance video caught an image of the robber, who looked to be wearing a white t-shirt on his head and a plastic bag over half of his face to conceal his identity. Police revealed that the man "became agitated and mumbled something under his breath as he walked out of the business."

Source: Gawker