Grand Unifying Guesses/Marvel Universe
EVERYTHING EVER is connected through the Marvel Universe.
The DC Universe is canon in the Marvel Universe. The Capcom Universe exists in the Marvel Universe. The SNK universe also exists in the Capcom universe. Disney owns Marvel, which connects everything Disney (from animated, live action, theme parks, toy lines, video games, Pixar) including the real world, (via ABC, ESPN) and the internet (via stakes in Hulu) to the same universe as Spider-Man. The Square-Enix universe intersects via Kingdom Hearts, which also connects to the Mario universe via Super Mario RPG. Super Mario then connects further with the universes of Zelda, Metal Gear Solid, Metroid, F-Zero, Donkey Kong, Star Fox, Ice Climber, Kirby, Pokemon, and Sonic (among many others). Freddy Krueger's involvement in MK connects the Friday the 13th, Hellraiser, Texas Chainsaw Massacre, Hallowen, and Childs Play franchises through Bride of Chucky. Kratos' involvement with MK connects it to the Greek Gods. A Spider-Man/President Obama crossover means that all actors in DC/Marvel movies are real and all of their roles are also real. From there it can go forever. A short example would be Kevin Nash being in The Punisher connects the Marvel Universe to the TMNT due to Kevin Nash playing Super Shredder. This also connects it to WWE (and therefore all promotions owned or mentioned by them) which connects it to all universes in which essentially all pro wrestlers have acted in.
This essentialy can end at Disney owning ABC and ESPN, connecting the Marvel Universe with the real world, which connects them to every piece of fiction ever. Including stories within stories.