Fool

https://en.wikipedia.org/wiki/April_Fools%27_Day

Top 100

http://hoaxes.org/aprilfool

Web

http://aprilfoolsdayontheweb.com/

Guardian

http://www.theguardian.com/theguardian/series/april-fools

Zone

http://aprilfoolzone.com/

Random

http://www.fooledbyrandomness.com/

Slides

http://www.slideshare.net/search/slideshow?searchfrom=header&q=april+fool

Tube

https://www.youtube.com/results?search_query=april+fool