Hands down, my favorite observed April Fools' Day prank yesterday was for "Scanless PCI." From the site:
Quite simply, it's the fastest, least intrusive, most cost effective PCI certification on the market. Our patent-pending scanless technology is just as effective as any PCI certification on the market, but far less costly to deploy and maintain.
To that end, I of course decided to get certified, too.
Hat tip to Rich Mogull at Securosis.