for me it would have to be the for honor prank even tho i dont play it or even like the game it was great the devs replaced all the low level NPC's with rabbits from Raving Rabbids it looks really goofy
One of the April Fool's day prank that I wish was true was Assassin’s Creed For Kinect. which was around Assassin's Creed 2 just so I could hear all the stories of people stabbing, kicking, running into their TVs.