A tourist walks into a pet shop. While he looks round, another customer comes in and says to the shopkeeper: 'I'll have an AutoCAD monkey please.' The shopkeeper fetches a monkey, hands it over and says: 'That'll be £5,000.' The tourist asks why it is so expensive.
'Ah, that monkey can draw in AutoCAD - very fast, clear layout, no mistakes, well worth the money.' The tourist looks at the monkey in another cage and says: 'That one's even more expensive. £10,000!' The shopkeeper replies: 'Oh, that one's a design monkey; it can design systems, lay out projects, mark up drawings, write specifications, even some calculations. All the really useful stuff.' The tourist looks round a little longer, and sees a third monkey. He gasps to the shopkeeper: 'That one costs £50,000! What on earth does it do?' The shopkeeper replies: 'I haven't actually seen it do anything, but it says it's a project manager.'