Common Sense

Knowledge that is common only amongst those who have some...

It's common sense (c.s.)...

-Not to tailgate. (Not c.s. if you've never ran into someone else's trunk.)
-Not to lean over a rail. (Not c.s. if you haven't leaned over and busted your face before.)
-Not to feed the wild animals. (Not c.s. unless you're missing a hand or two.)

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