Put sugar in bottom of old-fashioned glass and add a piece or two of lime. Add the lime juice and the rum half and half, taking care not to disturb the sugar too much. Add some ice and enjoy. -Tip- If after you finish one or two and want another but have to drive, add a little water to the now empty glass. You will get the same flavor without as much alcohol. -Tip- If you do not have rum, vodka works almost as well.