April Fools game ideas

I've been brainstorming some ridiculous event games for April Fools. Here's what I came up with:

• Militia only game: you can only build barracks and produce militia
• Hand-drawn graphics: same as regular game but with "improved" graphics
• Moon race: like the Antarctica event, but a play on the Nazis on the moon conspiracy theory
• Back in time: players start with everything researched, but as the game goes on the research tree goes backwards in time and players can no longer produce advances units
• Roswell 1947: aliens land in Roswell, New Mexico, and try to spread to other parts of the US