moon substance

[Garson O'Toole]

 Jonathan Lighter wrote
> _All Things Considered_ mentions that people think the "moon is made of
> cream cheese."

If the date on this book (linked) is accurate then some people have
been using the phrases below as early as 1786:

You would make be believe the moon is made of cream cheese.
To make one believe the moon is made of green cheese.

A Dictionary of English and Spanish and Spanish and English

http://books.google.com/books?id=KWn1OHPnJnsC&q=%22moon+is%22#v=snippet&q=%22moon%20is%22&f=false

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The American Dialect Society - http://www.americandialect.org