You know how an animal like a cat or a dog will reach up and push your hand aside if you have it lying on its back? How it will just reach up and try to bat you away?
I was disecting one of the dead mice, cutting open the mouth and jaw area, when it twitched and reached up with its left right forepaw to push my thumb away. Things can twitch when they are dead, and I was pushing down on its clavicle, which may have caused the limb to move, but my GOD. I literally cried out in horror. It took me a good long while to calm down and continue, and now I feel nauseated. Fucking science.