Hi there Bumodur. Sorry if it sounds like I'm picking on you, but that is not the case. One Appearance Food is the same sort of category as One Appearance Magazines. If the One Appearance category is already present on the article, then there is no need to add sub-versions of that category.
The Categories are there to define certain subjects/topics surrounding SpongeBob SquarePants, so only the main Categories are really needed: Food, Objects, Season 1 etc are all examples of large categories which help divide up the Wiki into manageable sizes.
If we add to many sub-categories then before we know it, each page will have its own category! :)
I hope you understand what I said there. This Wiki is trying to clean-up unneeded categories at the moment, so I hope you can help with that. Thanks for your support! =) --BobblesTalk 06:34, October 26, 2012 (UTC)