On superuser we tended to delete April fools day questions right after april fools day. We did it for two years (we forgot this year :/).

Last year we decided the questions had *historic* value, if nothing else for when its referenced on chat. I ended up [creating a meta question][1], similar to the many memes of meta, and added a screenshot from firefox to the question 

There should be no expectation of survival for a AFD gag, but really there's no reason it should be consigned to the dungheap of history. 


  [1]: https://meta.superuser.com/questions/7838/what-are-some-of-the-user-created-april-fools-gags-that-weve-had-in-the-past