Yeah its a painful thing!....My ex worked at a pet store and they had a few older big rats that we would play with. One day we figured we could let them see each other...ohhhhh bad idea, they were ripping each other to pieces, then i went to grab the one i was holding and it chomped all the way through my finger.....i almost stepped on the rat out of anger, but i refrained, and my ex used a big leather glove to pull them apart as they attempted to chomp her too....was quite the scene