April Fool's Day occurs on April 1st every year.
In every year other than 2015, the main page had this message:
| Congratulations! You are winner! Ha ha ha! You've just won an ... April Fools! Sorry, you haven't won anything. |  
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In 2015, as April Fool's Day coincided with the Echo of Downtown event, the message was
| Congratulations! You are winner! Ha ha ha! You've just won a rip in spacetime. April Fools! |  
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In 2018, as April Fool's Day coincided with Easter, if you found the Chocolate Bunny, the message became
| Congratulations! You are winner! Ha ha ha! You've just won an ... April Fools! Seriously, though, it's over towards <location>. |  
  | 
Profile page changes
- Level was preceded with a minus sign
 
- Class and avatar displayed:
 
- Character Sex was listed as the opposite of what it is
 
- Chips were listed followed by ",000,000" so 0 became 0,000,000 and all other numbers were multiplied by a million
 
- Account Created: April 1, 2008
 
Player Info
- Age was displayed as one of:
- Over-Medium
 
- Immature
 
- Decrepit
 
 
- Sex: fail
 
- Location was displayed as one of:
- Once was lost but now am found
 
- Your mom
 
- Mount Vernon, Kentucky
 
- Erewhon
 
- Someplace where I don't know where I am
 
- Stalking Ryme from his back yard
 
- Neverwhere
 
 
- Web Site: AOL. It's still the coolest!
 
- "April Fools!"  was added to the end of everyone's Quote.
 
Additional drops
All monsters had the ability to drop the following items:
Additional foes
The following could appear in any location, even as a result of a choice adventure, and even if that choice would have normally resulted in a non-combat:
These foes could drop the items above, and in addition to that:
Since April Fool's Day 2009
Profile page changes
- If you had a Sidekick/companion it was listed as one of:
- Imaginary friend
 
- Scrappy hobo
 
- Overinflated ego
 
- Pet tin can on a string
 
 
- Reputation was listed as one of:
- Smells funny
 
- Kinda a jerk
 
- Reprehensible
 
- Unsafe to invite to parties
 
 
- PvP Rank was listed as one of:
- Gets beaten up in the locker room
 
- Would lose to a Tennessee fainting goat
 
- Pathetic
 
- Worse than pathetic
 
 
- If you have a memento display: "This player has a memento display in the Look at Me I'm Special Because I Have Stuff Museum"
 
- If you are on a leaderboard: "This player thinks they're a hotshot on a leaderboard."
 
- Total (In-game) Time Played: Too much. Should get a life.
 
Additional Foes
April Fool's Day 2011
- Time Played This Run: blue?
 
- Days This Run: meatloaf
 
- Greedy capitalist has a player-owned shop down in the Mall
 
April Fool's Day 2013
- The were no profile page changes.
 
April Fool's Day 2014
Profile page changes
- Profile display went back to a pre 2011 version, the additions from the 2011 event not available (retcon history and player shop links unavailable).
 
- In addition all badge images were replaced by:
 

Additional Foes
April Fool's Day 2015
- Players' avatars, if not set to the default, were unchanged.  Otherwise, the image depends on the viewer's class:
 
- If you had a companion, it was listed as one of:
- Actual friend's pet cat
 
- The voices
 
- Imaginary friend's pet cat
 
- Suspiciously unscary clown
 
 
April Fool's Day 2016
Profile page changes
- Players' avatars, if not set to the default, were unchanged.  Otherwise, the image depends on the viewer's class:
 
- This player is a capitalist mutant traitor with a shop down in the Mall! Down with the Bourgeoisie!
 
- Retcon history: Rebooted More Times Than Your PC
 
- Time Played This Run: 525,600 minutes
 
- Days This Run: born yesterday
 
- In addition all badge images were replaced by:
 

April Fool's Day 2017
Profile page changes
- Players' avatars, if not set to the default, were unchanged.  Otherwise, the image depends on the viewer's class:
 
- In addition all badge images were replaced by:
 

April Fool's Day 2018
Profile page changes
- Player's avatars were reverted to pre 2015 version
 
- This player has completed X Hero Dashes, with a personal best time of Y seconds.
 
- Retcon history: Rebooted more often than your computer
 
- All badge images were replaced by:
 

April Fool's Day 2019
- Equipment shown in player profiles switched places at random.
 
- The run-down pyramid was added to the uncommon fool's item drops.
 
- All badge images were replaced by:
 

References
- Some of the joke locations refer to
 
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