Hah same thing happened when I was 4. My hamster, Butterscotch, liked to bite. So as punishment, I would squeeze him. One time I did it too hard and my mom said 'you killed him, look he's turning blue!" And sure enough, his little tummy area you could see his skin turning blue :blue:
I remember being confused at first, then we buried him. After that I understood the permanence of death and have babied every pet I've had since. Poor little guy with the giant evil child keeping him. Like Darla from Finding nemo. The horror..