“A rocket will never be able to leave the Earth’s atmosphere.”

“I see little commercial potential for the internet for the next 10 years.”<p>This is my favourite of the lot, for two reasons:<p>a) Gates said it on COMDEX in 1994, the same year when Amazon.com was founded.<p>b) I would dare say that he wasn't that much off -- he said <i>little</i> (and not "none"), and one could argue that Internet's commercial potential is still to be fully realized. At the very least, Amazon.com itself reached its first profitable quarter in 2001, making Gates' forecast much more accurate.

The actual New York Times article is funny and sad: <a href="http://web.archive.org/web/20080704103647/http://it.is.rice.edu/~rickr/goddard.editorial.html" rel="nofollow">http://web.archive.org/web/20080704103647/http://it.is.rice....</a><p>Robert Goddard was ridiculed for most of his life for having such lofty ambitions, chiefly building a machine that had even the possibility of ascending to Mars. Yet we owe it to him (and Konstantin Tsiolkovsky) that we have now sent machines and human beings to many worlds. I can't think of a better example of "don't listen to the haters."

All those comments have in common one thing: they are from people who claim that something can't be done, that others can't do/accomplish something.<p>Moral of the story: never claim that someone can't do something, no matter how unfeasible it might look. They might actually do it, and you will look silly.

"I think there is a world market for maybe five computers."<p>To be fair the computers he was referring to were behemoths with a small army of engineers maintaining them. How many of those are there today? Probably not that much more than five.