When I worked in a pet store that sold frozen feeders it was my job to get the feeders for people. I grabbed one large rat by the tail and it being stuck to the other rats the tail just snapped clean off. another time the rats were so frozen together that i had to bang the bag on the side of the freezer and one rat snapped in half.

I stopped getting the feeders for people after that... I just found that to be a little much at that point in time lol.