Why do one start to scratch once they see someone else scratching?


Question:
I sometimes noticed that when someone is itching and another person sees someone scratching really bad, that person starts to scratch also.
Answers:
I never noticed this about scratching though I do know this happens about yawning.

Other Answers:
This is one of the basis of Darwin's theory of evolution.
Hmmmm, because lice can jump from person to person?



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