Drinking coffee will sober you up (Getty Images)

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Wrong! Coffee won't sober you up because NOTHING can - you simply have to wait for your system to purge itself of alcohol. What a large dose of the black stuff will do is just make you a hyperactive drunk - and probably more annoying than you were before. And you won't be able to sleep afterwards. The theory is based on opposites - alcohol, the depressant, and coffee, the stimulant - cancelling each other out. Sadly, not true. Nor is the cold shower trick, but you could try it on one of your friends for a laugh.

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