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Preheat oven to 350.
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Line or grease and flour 1 12 cupcake cupcake pan.
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In a small saucepan, heat butter, coca cola and rum to boiling. Remove from heat and allow to cool.
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Mix together lime juice and milk in a small bowl* or measuring cup and set aside.
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Meanwhile, whisk together cocoa, flour, sugar, baking soda, baking powder and salt.
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Add the cooled butter/coke mixture and beat until well combined.
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Add egg, beat then pour in the milk. Mix until combined. The batter will be rather thin.
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Fill each well 2/3 of the way full. Bake 20 minutes or until a toothpick comes out clean. Remove cupcakes to wire racks as soon as possible to cool.
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Frost with Chocolate Rum Cream Cheese Frosting when cool.
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Garnish with a wedge of lime.
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*This will sour the milk a bit. Do not worry if it looks slightly curdled.