This is not an April Fool.
Shares of Microsoft dropped 11.4 percent today, representing the biggest single-day drop in over 13 years. The last time it occurred was on April 24, 2000, when shares plunged 15.6 percent as the world's largest software company locked itself in an antitrust dispute with the U.S. government. Since then, Microsoft has never experienced such a shelling, until today that is. This came after the software company posted dismal quarterly results due to weak demand for its latest Windows system and poor sales of its Surface tablet.
A lot of links available, below is only a very limited list
"Gotcha, you snot-necked weenies!" -- Post Bros. Comics