End user when criticizing a developer for 'taking long' to create something of value from scratch:
(4 hours later): "What's taking you so damn long? Are you retarded?"

Oh I don't know, maybe I have to make sure that tests in my code run well, maybe I have to evaluate everything to meet the custom satisfactions of the user for his ever-so-custom requirements and I also have to make sure I discard what they don't like? And maybe it takes time to deliver a quality product, and so on?
Or would you prefer I deliver an untested product that I didn't bother to think about and I haven't bothered to make sure it matches with their requirements?

What end users don't understand is the involvement in a quality product.