Yes I have had one before. I once had a rotten f/t mouse and oh my gosh.... You will never forget that smell. Never again. Also I once thawed out a frozen rat too quickly and you could just see the gut expanding and I was like "Whoa, definitely not going to give that to my bp to cause a huge mess" Yea you have to be careful because it's easy to thaw out a rat too quickly and then you have a HUGE mess on your hands.