Common Sense is one of Fallout GURPS advantages. See: Fallout GURPS.
Any time you start to do something that the GM feels is STUPID, he rolls against your IQ. A successful roll means he must warn you, Hadn't you better think about that? This advantage allows an impulsive player to take the part of a thoughtful character.”— Steve Jackson Games GURPS sources
With the abandonment of GURPS, Common Sense was removed from the game