This is a day where the liars of the world are surrounded by people who are imitating them. It is a glorious day where every single thing people say to you has to be analyzed twice, because even consistently honest people will lie on it and not even have the courtesy to wear a jester's cap. How trite. =P
In practice, this is fun for all, as people like to be fooled and will attend places more than they have in ages for a good bit of foolery. What kind of foolery have you guys run across along the net?
Yahoo Japan put some awesome effort into theirs: We Are Yahoo, Invasion Is Beginnning (http://event.yahoo.co.jp/invaders/beginning/)
Youtube is bringing the lame by rickrolling people. Sure, some poor saps find it funny, but they can do better. Where is my seaseme street news reporter features?
http://www.worldofwarcraft.com/wrath/features/bard/bardclass.xml The Bard is destined to rock the world of warcraft.
New unit in Starcraft 2, the Tauren Marine (http://starcraft2.com/features/terran/taurenmarine.xml)!