Yes, this is a real question! We recently failed an inspection for having the solid #12 ground wire of a MC wrapped counter-clockwise around the 10-32 ground screw to a metal 4"sq box.
I personally agree with the inspector. The problem is I can't find anything to back it up. I've looked in UL, manufacturer intructions, and NEC of course. I was able to find some manufacturer instructions for devices mentioning wrapping the wire clockwise around the terminal screws. Nothing specific to ground screws.
Some may ask, who gives a damn? But common kmowledge tells us when tightening the ground screw, the wire will tend to be pushed out when going the opposing direction. Therefore, by wrapping the wire clockwise you are getting a better more reliable connection.
So, to get to the point. Help me prove it is a code violation to wrap the wire counter-clockwise.
I'm counting on your help and support in this highly important subject.