How to Turn Down a Client

I'm in a bit of a quandry, and I know this is the place to find my answer.

I had a meeting yesterday with a prospective client who is, to put it 
mildly, all over the place.  He knows that he wants a website, however his 
ideas kept changing midstream as to what he actually wants on it, or what 
he wants the website for.  It seemed that he was thinking this stuff 
through while we were having our meeting, as opposed to having thought it 
out beforehand.

I won't go into the gory details (believe me it was scarey), but I ended 
the meeting by leaving him my literature which specifies that the client is 
to contact me *after* he has decided what he wants on the site.

Here's my question:  *If* this guy calls me again and I find that he still 
doesn't have a clue, how do I turn him down nicely?

-- Sandy 

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