In 1995, Robert Metcalfe, a co-inventor of Ethernet, famously predicted that the internet would "catastrophically collapse" within a year.
Ken Olsen, the co-founder of Digital Equipment Corporation (DEC), made this prediction in 1977. Of course, today, personal computers are ubiquitous.
Thomas Watson, then chairman of IBM, made this statement, vastly underestimating the global demand for computers.
Darryl Zanuck, co-founder of 20th Century Fox, couldn't have been more wrong about the future of television.
The SR-71 Blackbird was an impressive aircraft, but it was retired in 1998. Commercial planes today, while not as fast, are capable of carrying hundreds of passengers.
Attributed to Bill Gates, this statement (though disputed) suggests a misunderstanding of future computing needs. Today's computers use gigabytes and terabytes of memory.
The president of the Michigan Savings Bank advised Henry Ford's lawyer not to invest in the Ford Motor Company because he thought the automobile was just a passing trend.