The story behind the letter below is that there is a nutball in Newport, Rhode Island named Scott Williams who digs things out of his backyard and sends the stuff he finds to the Smithsonian Institute, labelling them with scientific names, insisting that they are actual archaeological finds.  This guy really exists and does this in his spare time!
Anyway, here's the actual response from the Smithsonian Institution.  Bear this in mind next time you think you are challenged in your duty to respond to a difficult situation in writing.

Smithsonian Institute
207 Pennsylvania Avenue
Washington, DC 20078

Dear Mr. Williams:
Thank you for your latest submission to the Institute, labelled "93211-D, 
layer seven, next to the clothesline post, Hominid skull."  We have given 
this specimen a careful and detailed examination, and regret to inform you 
that we disagree with your theory that it represents conclusive proof of the
presence of Early Man in Charleston County two million years ago.  Rather,
it appears that what you have found is the head of a Barbie doll, of the 
variety that one of our staff, who has small children, believes to be "Malibu 
Barbie."
It is evident that you have given a great deal of thought to the analysis of 
this specimen, and you may be quite certain that those of us who are familiar
with your prior work in the field were loathe to contradict your findings.  However,
we do feel that there are a number of physical attributes of the specimen which 
might have tipped you off to its modern origin:
1.    The material is moulded plastic.  Ancient hominid remains are typically fossilised bone.
2.    The cranial capacity of the specimen is approximately 9 cubic centimetres, well below
      the threshold of even the earliest identified proto-hominids.
3.    The dentition pattern evident on the skull is more consistent with the common
      domesticated dog than it is with the ravenous man-eating Pliocene clams you speculate
      roamed the wetlands during that time.
This latter finding is certainly one of the most intriguing hypotheses you have submitted in
your history with this institution, but the evidence seems to weigh rather heavily against it.
Without going into too much detail, let us say that:
1.    The specimen looks like the head of a Barbie doll that a dog has chewed on.
2.    Clams don't have teeth.
It is with feelings tinged with melancholy that we must deny your request to have the specimen
carbon-dated.  This is partially due to the heavy load our lab must bear in its normal operation,
and partly due to carbon-datings notorious inaccuracy in fossils of recent geologic record.
To the best of our knowledge, no Barbie dolls were produced prior to 1956 AD, and carbon-dating
is likely to produce wildly inaccurate results.
Sadly, we must also deny your request that we approach the National Science Foundation Phylogeny 
Department with the concept of assigning your specimen the scientific name Australopithecus 
spiff-arino.  Speaking personally, I, for one, fought tenaciously for the acceptance of your
proposed taxonomy, but was ultimately voted down because the species name you selected was 
hyphenated, and didn't really sound like it might be Latin.
However, we gladly accept your generous donation of this fascinating specimen to the museum.  
While it is undoubtedly not a Hominid fossil, it is, nonetheless, yet another riveting example
of the great body of work you seem to accumulate here so effortlessly.  You should know that 
our Director has reserved a special shelf in his own office for the display of the specimens
you have previously submitted to the Institution, and the entire staff speculates daily on 
what you will happen upon next in your digs at the site you have discovered in your Newport 
back yard.
We eagerly anticipate your trip to our nation's capital that you proposed in your last letter,
and several of us are pressing the Director to pay for it.  We are particularly interested in
hearing you expand on your theories surrounding the trans-positating fillifitation of ferrous 
ions in a structural matrix that makes the excellent juvenile Tyrannosaurus Rex femur you 
recently discovered take on the deceptive appearance of a rusty 9-mm Sears Craftsman 
automotive crescent wrench.

Yours in Science,
Harvey Rowe
Chief Curator-Antiquities

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