I have a weird one, random ash piles and plasma goo just appear. Some can be looted and some seem connected to still living characters. When in sneak mode some of the piles can be pick-pocketed, but you can still get caught and have rep change depending on who/what that particular pile is attached to. It seems very prevalent at the Nipton Rest Stop (but appears everywhere,) with the Jackal gang members that spawn there. This happened to me in Fallout 3 as well. If this keeps up I'm gonna go back to playing cards with my friends! I can't go back to playing euchre with those idiots, it's just not right...