Handyman 1 (the previous homeowner) decided to replace an ungrounded receptacle with a grounded one, so he put a wire from a cable clamp screw to the new recept. OK, not code-compliant, but better than usual.
That is, if this house wasn't wired with NM Cable.
Thankfully inspector 2 (Falls Twp.) caught it and Handyman 2 (the "fixit so we can sell it" one) removed it.
Ian (Hope I'm doing this right) A.