1/4 oz of sweet and sour mix
1/2 oz of Skyy vodka (or Vodka)
1/4 oz of Bacardi Gold Rum (or Light Rum)
1/4 oz of Bacardi 151 rum (or overproof rum)
1/2 oz of cosmopolitan mix
Pour all ingredients into a cocktail shaker half-filled with ice cubes. Shake well, strain into a double-shot glass, and serve.