Why do we use cucumber to describe the attitude of a person who is able to control his/her temper in front of a difficult event?
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This entry in the Encyclopedia of Word and Phrase Origins (p133) has the answer:
In addition to Shoe's answer, cucumber slices over the eyes are a long-standing folk remedy, rejuvenated into a modern luxury spa treatment. If you've never tried it, they really do have a soothing, cooling effect even if they weren't previously refrigerated.