With just that small addition:

  
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class Symbol
  alias_method :old_eeq, :"===" 

  def ===(obj)
    (obj.respond_to?(self) && obj.send(self)) ||
    old_eeq(obj)
  end
end

you can do things like

  
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case current_user
when :admin?    then "admin"
when :regular?  then "something_for_regulars"
when :guest?   then "do_guest_stuuff"
else "huh"
end

Isn't that cool much more readable?