I did lost my pet for a short while! My hamster didn't ever tried to sneak out of her little box but this one time she just got out of her cage and disappeared! We couldn't find her for a day and I was getting worried sick - I knew it was the end of her if she had ran away. Luckily, the next day I was again checking (for the last time) all the places around my room and I found her behind my TV. It was such a relief! I don't even know how she managed to jump out of her cage and not die, then run around in my room for almost 24 hours and then find her way on a separate table and hide there. It's still a huge mystery to me!