Girls, when you hit a guy in the arm after he makes you laugh, is it a subconcious thing?

Or are you actually trying to get a message across and make an effort to hit him? This girl used to "swing" her hand close to my arm when I made a joke but yesterday she actually gave me a good slap lol. Do you go around hitting anybody that makes you laugh or is there a special meaning behind it.
Girls, when you hit a guy in the arm after he makes you laugh, is it a subconcious thing?
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