Astronaut

1 1/2 oz vodka
1 1/2 oz light rum
1 1/2 oz dark rum
4 - 5 oz Sprite soda
1 splash pineapple juice

Pour the vodka, light rum and dark rum into a cocktail shaker half-filled with ice cubes. Shake well, and strain into a highball glass filled with ice cubes. Add Sprite and a splash of pineapple juice. Serve with a twist of lime (or lemon), and serve.