Let's add some more:

“I think there is a world market for maybe five computers.”

Thomas Watson, president of IBM, 1943

“Television won’t be able to hold on to any market it captures after the first six months. People will soon get tired of staring at a plywood box every night.”

Darryl Zanuck, executive at 20th Century Fox, 1946

“There is no reason anyone would want a computer in their home.”

Ken Olsen, founder of Digital Equipment Corporation, 1977

“Almost all of the many predictions now being made about 1996 hinge on the Internet’s continuing exponential growth. But I predict the Internet will soon go spectacularly supernova and in 1996 catastrophically collapse.”

Robert Metcalfe, founder of 3Com, 1995

“Apple is already dead.”

Nathan Myhrvold, former Microsoft CTO, 1997