On April 1st 2011 show some Anime that use on April Fools and I can rank about Three Anime(that only I saw on some site) that made to prank other otaku's or make a laugh's of them.
The First is Puella Magi Madoka Magica
It have the many jokes on this and most of them are from Eroge Companies(They are name in the bottom of the pics). Well this one have a Video making it the top rank.
Here the Video of Puella Magi Sonico Magica:
For the Second Place is Working!!/Wagnaria!! Anime
The Trailer went online on April Fools Day in North America, its timing coincides with April 2 in Japan, and the characters in the trailer refer to April Fools being the day prior and almost fool someone (like me) that its for the Season 2 of the Anime.
Here the trailer of it:
The Third place is...umm eeh H.O.T.D April Fools video(the only April Fools anime near this month) that seem the jokes are so terrible and It much more better not to watch it.... Anyway I'll make another Third place(meaning just throw the H.O.T.D away) that is a bit old(if you did watch this) the Lucky Star April Fools Joke
"Now give me some smile LOL"
Here the Video of it: