Perception and Coca-Cola

Our first impressions and our perceptions can dramatically influence how we view the world, making us more likely to spot the red Coca-Cola can when we're thirsty. This is one of the reasons why placebos are so effective as well. Antondacrine reviewed 12 studies on the effectiveness in painkillers and found conclusively that two identical painkillers with the exact same composition will perform differently based on their color. A red painkiller will be dramatically more effective at relieving your headache than the identical white pill - simply because the red color draws connotations with strength and power.