Yesterday, I was poking around the Lost Media Wiki when I uncovered an article about a missing SpongeBob short titled "Gary's Shell". The premise was similar to Shell Shocked. They said the only source of other info they found for this short was that it was aired 2002. It still isn't known of the short even exists or if this is a hoax. I would personally think this could be a real short. Then again we don't have any real evidence.