Cartoon Network Universe: Fusionfall is an mmorpg created by Cartoon Network. Even though it isn't that popular people have tried to combine it with other memes like Guile's Theme.Here's an example by youtuber smashbros379ful: https://www.youtube.com/watch?v=Q8MJHDyMTC0 . There are others that will pop up sooner or later but until we find others this is a good example of one.