Lupin the 3rd S03 E02 Expose The Great Trap

With the permission of the ICPO Captain, Inspector Zenigata hatches a foolproof plan to at last capture Lupin. By melting down six tons of gold, forging it into the shape of a meteor, and then televising it's discovery to the world, Zenigata is positive Lupin will try to steal it. Indeed, Lupin does steal it; but under closer inspection with Goemon's sword, the meteor appears to be a gold-plated rock.