Don't quote me on that!
The following is a collection of quotes from people who probably wish they'd kept their mouth shut. We leave it to you to draw your own lessons from them:-

"Computers in the future may weigh no more than 1.5 tons."
-- Popular Mechanics, forecasting the relentless march of science, 1949

"I think there is a world market for maybe five computers."
-- Thomas Watson, chairman of IBM, 1943

"I have traveled the length and breadth of this country and talked with the best people, and I can assure you that data processing is a fad that won't last out the year."
-- The editor in charge of business books for Prentice Hall, 1957

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"But what ... is it good for?"
-- Engineer at the Advanced Computing Systems Division of IBM, 1968, commenting on the microchip.

"There is no reason anyone would want a computer in their home."
-- Ken Olson, president, chairman and founder of Digital Equipment Corp., 1977

"This 'telephone' has too many shortcomings to be seriously considered as a means of communication. The device is inherently of no value to us."
-- Western Union internal memo, 1876.

"The wireless music box has no imaginable commercial value. Who would pay for a message sent to nobody in particular?"
-- David Sarnoff's associates in response to his urgings for investment in the radio in the 1920s.

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"The concept is interesting and well-formed, but in order to earn better than a 'C,' the idea must be feasible."
-- A Yale University management professor in response to Fred Smith's paper proposing reliable overnight delivery service. (Smith went on to found Federal Express Corp.)

"Who the hell wants to hear actors talk?"
-- H.M. Warner, Warner Brothers, 1927.

"I'm just glad it'll be Clark Gable who's falling on his face and not Gary Cooper."
-- Gary Cooper on his decision not to take the leading role in "Gone With The Wind."

"A cookie store is a bad idea. Besides, the market research reports say America likes crispy cookies, not soft and chewy cookies like you make."
-- Response to Debbi Fields' idea of starting Mrs. Fields' Cookies.

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"We don't like their sound, and guitar music is on the way out."
-- Decca Recording Co. rejecting the Beatles, 1962.

"If I had thought about it, I wouldn't have done the experiment. The literature was full of examples that said you can't do this."
-- Spencer Silver on the work that led to the unique adhesives for 3-M "Post-It" Notepads.

"So we went to Atari and said, 'Hey, we've got this amazing thing, even built with some of your parts, and what do you think about funding us? Or we'll give it to you. We just want to do it. Pay our salary, we'll come work for you.' And they said, 'No.' So then we went to Hewlett-Packard, and they said, 'Hey, we don't need you. You haven't got through college yet.'"
-- Apple Computer Inc. founder Steve Jobs on attempts to get Atari and HP interested in his and Steve Wozniak's personal computer.

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"Professor Goddard does not know the relation between action and reaction and the need to have something better than a vacuum against which to react. He seems to lack the basic knowledge ladled out daily in high schools."
-- 1921 New York Times editorial about Robert Goddard's revolutionary rocket work.

"You want to have consistent and uniform muscle development across all of your muscles? It can't be done. It's just a fact of life. You just have to accept inconsistent muscle development as an unalterable condition of weight training."
-- Response to Arthur Jones, who solved the "unsolvable" problem by inventing Nautilus.

"Heavier-than-air flying machines are impossible."
-- Lord Kelvin, president, Royal Society, 1895.

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"Airplanes are interesting toys but of no military value."
-- Marechal Ferdinand Foch, Professor of Strategy, Ecole Superieure de Guerre.

"Everything that can be invented has been invented."
-- Charles H. Duell, Commissioner, U.S. Office of Patents, 1899.

"Louis Pasteur's theory of germs is ridiculous fiction".
-- Pierre Pachet, Professor of Physiology at Toulouse, 1872

"The abdomen, the chest, and the brain will forever be shut from the intrusion of the wise and humane surgeon".
-- Sir John Eric Ericksen, British surgeon, appointed Surgeon-Extraordinary to Queen Victoria 1873.

"640K ought to be enough for anybody."
-- Bill Gates, 1981