It doesn't matter what he does, he will never amount to anything. Albert Einstein's teacher, 1895. The bomb will never go off. I speak as an expert in explosives. Admiral William Leahy, U.S. Atomic Bomb Project.
Airplanes are interesting toys but of no military value.
Marechal Ferdinand Foch, Professor of Strategy, Ecole Superieure de Guerre. There will never be a bigger plane built. A Boeing engineer, after the first flight of the 247, a twin engine plane holding ten people. The time may come when whole communities may migrate south in the winter, or move to new lands whenever they feel the need for a change of scenery. Arthur C. Clarke, Vogue, 1966.