April fool's day pranks

I ran into a few hoaxes yesterday - the April fool's day. A good one was from the economist Greg Mankiw about the an auction at Harvard for slots in classes . I was curious on what kind of pranks or hoaxes get more attention. Google search gave a few interesting results. The best site is here which lists the top 100 hoaxes of all time. I really like the instant color tv hoax. Have fun.