Well, when I was squatting in the woods, I would be more careful with the full moon out, mostly because people can see better in the night with all the light- though overcast nights have similar effects because of the light pollution, if the clouds clear then there's no light. It just seemed that of the nights people wanted to go crazy, they'd choose a full moon because they wouldn't really need a flashlight, because most people who aren't us don't go around with flashlights. Or maybe it's a cultural thing, I don't really know.