While my daughter was growing up, I had a random choice of what to step on if I went walking barefoot around the apartment in the middle of the night. I could step on a Lego, which is quite painful, or step on one of her goldfish that had jumped out of the tank. If you can see in the dark, pick the Lego. They won't die if you squash them and you don't have to explain to a little girl how you killed her pet fish. She is 40 years old now and still reminds me of this. You would think people would move on... Personally, I think the fish was depressed.