Phoenician grinning mask century BCE) found in San Sperate, Sardinia, on display at the National Archaeological Museum of Cagliari. It's an example of the "sardanios ghelos", the sardonic laugh mentioned by Homer and others in ancient times.
From the original pinner: "'Underground Explorer's Helmet' is an odd steampunk masterpiece. It's essentially a helmet with and oxygen tank and a light. By Tom Banwell." That would be BADASS if it actually worked!