It (has) occurred to me that a computer is a stupid machine with the ability to do incredibly smart things, while computer programmers are smart people with the ability to do incredibly stupid things. They are, in short, a perfect match.'
Bill Bryson

Rubbish in

'Imagine if every Thursday your shoes exploded if you tied them the usual way. This happens to us all the time with computers, and nobody thinks of complaining.'
Jeff Raskin

Rubbish out

'Computers make it easier to do a lot of things, but most of the things they make it easier to do don't need to be done.'
Andy Rooney