Crystal Skull Pirate Shot Glass Drink Cocktail Beer Cup. This is a double-walled shotglass, but instead of the inner wall being shaped like a shotglass, it’s shaped like a skull. When you pour in your favorite spirit, it inhabits the inner skull, coloring it in quite nicely. As a bonus, it also keeps the beverage in the shot glass cooler, if it takes you a while to build up the courage to drink it.