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You use your common sense when you need to. THAT WHAT I SAID IS COMMON SENSE!
Common sense is not so common.
My most common sense is my sense of humor.
Some early American Colonist wrote a book called "Common Sense".
Common Sense was called 'common sense' because Thomas Paine chose to call it that.
Common Sense, The Crisis, The Rights of Man, Age of Reason.
No... no it is not.
The 6th sense is spoken for, so that makes common sense the seventh sense!