What is the funniest April Fool's Joke you ever heard?

[cartoonmayhem]

Honestly, it's been so long since I heard a really good prank that I am just wondering?

Did you pull a good prank on someone or heard of a really funny April Fool's joke that bears repeating?

I mean aside from the pranks on this site:
http://www.museumofhoaxes.com/hoax/aprilfool/