"Stand and Deliver" and "Gates of Gloom" from Scooby-Doo! Mystery Incorporated were entered into IMDb in 2012, a full year before anyone knew about them. It is likely they were entered by a writer or crewmember of the show, given it is impossible for anyone else to have guessed the titles over a year before they were aired. Here is a link from WebArchive (which unfortunately only shows "Stand and Deliver," but I am positive that "Gates of Gloom" was posted shortly after even though WebArchive only took that one screenshot of the IMDb page in 2012).
~ WildwindVampire ~