So I'm walking down the slums of New Vegas in Freeside with my trusty plasma pistol at hand. Suddenly out of nowhere a giant rat appears, being chased by some orphan kids. I say to myself; that rat may hurt these kids and the hero that I am, I quickly grab my plasma gun and put that critter out of its misery with one clean plasma shot. It disintegrates into a radiant green color - a goo pile of you will.

One E-Cell drained so the children can play safe - a small price to pay right? Well while that may be, it would seem these kids were hungry. These kids were chasing the giant rat so they could eat it. In fact these kids were so hungry, they started eating the goo pile. Kneeling before the green goo pile, they start picking the goo and stuffing their faces with it. I ask the girl child to see why she was eating the goo and she just replied "Thanks mister".

I found a video that's similar to this occurrence: enjoy