Nyan Cat and Keyboard Cat were added into Scribblenauts as little internet references.
Then the meme creators sued Warner Bros. and the game studio.
The case was settled, and the cats were officially licensed.
Two memes basically got legal representation.
"The 3DS version of Scribblenauts Unlimited had a special edition sold exclusively at GameStop, which included an officially licensed pencil-shaped stylus and a case themed after the series’ main character, Maxwell." #3DSFacts
*Fact By @Panda_Dude17*
Fact 28: Zombies will die when they touch a lawnmower. This is a reference to Plants vs Zombies because each row has a lawn mower at the end that kills all the zombies in the lane when one happens to reach it
"In North America, Scribblenauts Unlimited included Mario and Zelda characters exclusively in the Wii U version because the 3DS version was already in production when the licensing deal was made.
In Europe, the game was delayed several times so they were able to be included."
Here is a list of every single game that Nintendo published from a third-party developer during the Nintendo 3DS generation; Games with no asterisk indicates that it was published by Nintendo in America and Europe, but not Japan.