1998
"All Bonds" cheat in GoldenEye 007. The cheat was said to be able to unlock three of the actors who played James Bond (Sean Connery, Roger Moore, and Timothy Dalton) as playable multiplayer characters.
The joke stems from a rumored statement that Rare made where one could play as those Bonds but couldn't get licenses to get their likenesses. However, their faces are still in the game's code. This feature later turned out to be true, but one required a GameShark to unlock it.
Read more about this topic: EGM April Fools' Jokes