According to a survey done by psychologists at the Durham University, people who drink more than seven cups a day tend to hallucinate more than the average consumer. So supposedly too much coffee can make a person hear voices. Now, I haven’t gone to that point, but now I’m wondering about all the regular customers at Starbucks. What do they hear? I would like to ask, but they probably would be bothered by another voice. If you want to know more, check out this article.