Most famous April fool jokes are the Google ones obviously

http://techcrunch.com/2014/04/01/best-of-april-fools-2014-ro...

http://thenextweb.com/shareables/2014/04/01/the-best-tech-ap...

http://www.ign.com/wikis/april-fools-day-game-pranks/2014_Ap...

http://www.theguardian.com/media/2014/apr/01/april-fools-jok...

bonus!

https://www.kayak.com/bathrooms/ (spoiler: there is a game!)