Entwistle's Error Cocktail

Ingredients:
2 fluid ounces or 6 centilitres of Dark Rum
1/2 a fluid ounce or 1.5 centilitres of Lemon Juice
4 fluid ounces or 12 centilitres of Tonic Water
1/2 a fluid ounce or 1.5 centilitres of Lemon Juice
4 fluid ounces or 12 centilitres of Tonic Water
Instructions:
Pour all of the ingredients into a highball glass almost filled with ice cubes. Stir well.
