Our Supply Clerk at the factory where I work, discovered a box that was left on the loading dock with this warning printed on it: DANGER DO NOT TOUCH!  

Management was called and all employees were told to stay clear of the box until it could be analyzed.  

When the foreman arrived, he donned gloves and safety glasses, and then, very carefully opened the box. Inside were 25 signs that read: DANGER! DO NOT TOUCH!