Well, actually it's the Augenroller (Eye Roller) which can be found on the clock tower in the AltStadt in Koblenz. Its eyes move back and forth ticking off the seconds, and every hour and half hour its tongue will protrude from its mouth.
The Augenroller is Johann Lutter of Koburn who was a bandit. He was captured and after prolonged torture he confessed to his crimes and was sentenced to be beheaded on October 14, 1536. As he was led to the site of his execution he proclaimed 'Establish a monument to me and it will bring you luck!'.
While on the platform he is said to have rolled his eyes and stretched out his tongue for the spectators and once his head lay severed it continued to roll its eyes and flap its tongue. This was taken as a sign from god so the citizens established the Augenroller monument!
Match reports from The Worlds in Koblenz are on their way soon..