Crystal Skull by Wolftron.

Fred and Friends Doomed Crystal Skull Shotglass

This formidable shot glass is Fred's tribute to the Skull of Doom, which Mayan legend claims has the power of life and death, the power to heal or to smite, the power to create miracles. We make no claims beyond these: this glass will hold 2 ounces of your favorite beverage and will stare right in your eye as you down your shot. Don't blink! Hand-blown crystal-clear borosilicate glass, individually packaged in a colorful yet mysterious giftbox.