Here are a few of the all-time best April Fool's Hoaxes:
Sidd Finch In its April 1985 edition, Sports Illustrated published a story about a new rookie pitcher who planned to play for the Mets. His name was Sidd Finch and he could reportedly throw a baseball with startling, pinpoint accuracy at 168 mph (65 mph faster than anyone else has ever been able to throw a ball). Surprisingly, Sidd Finch had never even played the game before. Instead, he had mastered the "art of the pitch" in a Tibetan monastery under the guidance of the "great poet-saint Lama Milaraspa." Mets fans everywhere celebrated at their teams's amazing luck at having found such a gifted player, and Sports Illustrated was flooded with requests for more information. But in reality this legendary player only existed in the imagination of the writer of the article, George Plimpton.
The Taco Liberty Bell In 1996 the Taco Bell Corporation announced that it had bought the Liberty Bell from the federal government and was renaming it the Taco Liberty Bell. Hundreds of outraged citizens called up the National Historic Park in Philadelphia where the bell is housed to express their anger. Their nerves were only calmed when Taco Bell revealed that it was all a practical joke a few hours later. The best line inspired by the affair came when White House press secretary Mike McCurry was asked about the sale, and he responded that the Lincoln Memorial had also been sold, though to a different corporation, and would now be known as the Ford Lincoln Mercury Memorial.
Nixon for President
In 1992 National Public Radio's Talk of the Nation program announced that Richard Nixon, in a surprise move, was running for President again. His new campaign slogan was, "I didn't do anything wrong, and I won't do it again." Accompanying this announcement were audio clips of Nixon delivering his candidacy speech. Listeners responded viscerally to the announcement, flooding the show with calls expressing shock and outrage. Only during the second half of the show did the host John Hockenberry reveal that the announcement was a practical joke. Nixon's voice was impersonated by comedian Rich Little.
Alabama Changes the Value of PiThe April 1998 issue of the New Mexicans for Science and Reason newsletter contained an article claiming that the Alabama state legislature had voted to change the value of the mathematical constant pi from 3.14159 to the 'Biblical value' of 3.0. Before long the article had made its way onto the internet, and then it rapidly made its way around the world, forwarded by people in their email. It only became apparent how far the article had spread when the Alabama legislature began receiving hundreds of calls from people protesting the legislation. The original article, which was intended as a parody of legislative attempts to circumscribe the teaching of evolution, was written by a physicist named Mark Boslough.