From: Patrick Li <patrickli_2001@...>
Date: 2008-08-16T02:53:00+09:00
Subject: Re: Ruby: Boolean Challenge

heh...
this will work... but i wouldn't suggest using it for anything other 
than intellectual enjoyment.

class FalseOddRecognizer < NilClass
  //#same methods as TrueOddRecognizer
end

class TrueOddRecognizer
  //#same methods as before
end

Now, in knows(), return a FalseOddRecognizer when false and a 
TrueOddRecognizer on true.

The trick is that Ruby evaluates all subclasses of NilClass to false.

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