x.rb

class BlankSlate
  instance_methods.each { |m| undef_method m unless m =~ /^__/ }
end

class Stuff < BlankSlate
  def initialize(obj)
    @obj = obj
  end

  def to_s
    @obj.to_s
  end

  def method_missing(sym, *args, &block)
    return
  end
end

z = Stuff.new("bleh")

# => ?
puts "z => ?"
puts z.class
puts z.class.class
puts (z.is_a?(Object) ? "is" : "not") + " an Object"
puts z.__send__("class")
puts z.inspect
puts z

z2 = z.clone

puts "\nz2 => ?"
puts z2.class
puts z2.class.class
puts (z2.is_a?(Object) ? "is" : "not") + " an Object"
puts z2.__send__("class")
puts z2.inspect
puts z2