Earlier on Saturday, a user claiming to have leaks from an industry contact began to drop images on 4chan's /v/ board. While video game "leaks" are rather sketchy, the more recent leaks for Smash Bros. for Wii U/3DS have been more reliable than most, with images of characters leaking weeks before official release.
When the first image of Rayman dropped, the internet went nuts while still remaining somewhat skeptical of the images. It wasn't until later that day, when a (now deleted) video was released showing Ubisoft's mascot in-game, created the full-blown hype-train.
I admit, I fell for the supposed leak, and I quickly joined the hype in anticipation for an official announcement on the character's inclusion. Unfortunately, the hopes and dreams of thousands of Smash players were quickly crushed the next day when YouTube user Artsy Omni released the above video showing how he faked it out.
It's quite an impressive feat to troll the internet to such an extent, and even more impressive watching the process of creating the fake leak. It's unfortunate to see the amount of hate Omni has received after the reveal (as seen by the venomous comments on YouTube), because this is an incredibly elaborate and well created hoax. If anything, Omni just proved once and for all that you should never believe anything you read on the internet.