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hair
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For more on marking an answer as the "Best Answer", please visit our FAQ.Although we are 'civilised' as a species, a number of our primeval characteristics still remian, and this is one.
Early man would have been covered with hair to keep him warm, and to act as protection from attack. Any 'fight-or-flight' stimulous, fear being the most obvious, causes the skin around hair folicles to contract, and the hair to stand up, to provide warmth and protection.
In modern man, the absence of serious hair covering means that only certain areas communicate that sensation to the brain - the back of the neck being the most obvious, but the hair on the arms performs similalry, and is a visible reaction.