Ruby off the deep end

OMG.rb

class Foo
  def method_missing(*args)
    puts("Called with: #{args.inspect}")
    4
  end
end

class Bar < Foo
  def respond_to?(*args)
    super
  end
end

class Baz < Bar
end

[Foo.new].flatten rescue puts "Foo throws an exception!"
[Bar.new].flatten rescue puts "Bar throws an exception!"
[Baz.new].flatten rescue puts "Baz throws an exception!"