Dr Tom Stafford, psychologist from Sheffield University, says a person's brain is trained to believe the daily ritual of making coffee or tea should be done in a certain way in order to derive maximum enjoyment. He said: "Drinking tea and coffee is very ritualistic and people become very addictive to the way they want their brew made." Caffeine is very much a drug of reward and like any addict, people develop passions on how the drug is delivered. "Where ever there is drug use then rituals will always develop.