Every possible meme, with every possible pop-culture reference, from every possible show, and every possible movie, and every possible game from every possible universe. EVER.
Can you imagine if something like this happened more often? Dimensions diving into each other? Multiverses colliding? The USS Enterprise popping out of nowhere right in front of The Millenium Falcon? Or An Eva unit getting back-up from a Gundam while trying to fight with Getter Robots as Macross Jets give aerial support to a bunch of Autobots? Or Samus wearing her Dark Suit dropping by to help out Isaac Clarke in Dead Space with Gordon Freeman?
This is insane. I love it.