Chocolate is lower in caffeine than tea, coffee and coca cola. A one ounce bar of chocolate contains about 6mg of caffeine, whereas a five ounce cup of regular coffee contains over 40mg.
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It has been shown that caffeine causes headaches when stopped suddenly and can cause morning headaches that are relieved by a dose of caffeine.
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In England, there's a phenomenon called the "half-time kettle effect" where power use surges at half-time during England's matches in the World Cup as everyone turns on their tea kettles at the same time.
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You can overdose on caffeine.
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Caffeine boosts memory.
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Englishmen drink more tea than any person of any other nation (over twenty times more than Americans)
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