It's definitely not the original as I read this years ago, however it's the first one coming up in Google so this is what I'm linking to: http://twasink.net/blog/archives/2004/10/if_architects_h.html
Dear Mr. Architect:
Please design and build me a house. I am not quite sure of what I need, so you should use your discretion. My house should have somewhere between two and forty-five bedrooms. Just make sure the plans are such that the bedrooms can be easily added or deleted. When you bring the blueprints to me, I will make the final decision of what I want. Also, bring me the cost breakdown for each configuration so that I can arbitrarily pick one.
It'd be funny if it wasn't true, snassen fassen rassen.