"On two occasions I have been asked [by members of Parliament], 'Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?' I am not able rightly to apprehend the kind of confusion of ideas that could provoke such a question." -- Charles Babbage
In their defense, that's a great way to filter out snake oil salesmen that would happily take your money and promise you a machine that will give you the right answer no matter what.
