April Fools' Day pranks made by companies
April Fools' Day gets trademarked
The group-buying site went all-out for its prank, launching a whole website announcing its latest acquisition - the intellectual trademark to April Fools' Day itself. The website claims it will crack down on patent offenders - i.e. others who try to do April Fools' pranks - and includes many features, including a fake patent application (pdf), a quiz to take to see if you are an April Fool, a "prank shop," and a list of planned pranks for the next 20 years, including entries such as "2014: Fake dealtime-machine ride back 6,000 years to witness creation of Earth."