I remember being 6 or 7 years old and anxiously waiting for my cousins to visit us so I could take my shiny Nintendo NES console from its box, hook it to our 14" Sony TV, and play with them a few rounds of Super Mario Bros or Contra. I don't think we ever got past the third or fourth world on one run, but we did use the secret warp pipes to move to later worlds.
Apparently, Super Mario Bros was released the same year that I was (ha!) in 1985, and it celebrated its 30th birthday yesterday, September 13. To wit Google has decided to give all of us a nostalgic easter egg when performing a search for "Super Mario Bros."
If you subscribe to the vastly-oversimplified concept of a multiverse, then you must believe that, given an infinite set of potential universes, all possible things can and must occur in at least one world parallel to our own. Which means that somewhere, on some alternate version of Earth, Super Mario Bros. stars a textured-yet-pixelated biker named Manley who is trying to track down his kidnapped motorcycle. Kidnapped, that is, by aliens.
To the game's credit, it's completely up front about what it is: "This retro platform game pays tribute to, and parodies, classics such as Super Mario Bros., CastleVania and Mega Man, in style!"