Temporarily by-pass access modifiers on an object.

PrivacyViolator.rb

#!/usr/bin/ruby

def disrespect_privacy(symbol, &block)   # access private methods in a block
  raise ArgumentError, 'Block must be specified' unless block_given?

  block_binding = block.binding
  target_object = block_binding.local_variable_get(symbol)
  block_binding.local_variable_set(symbol, PrivacyViolator.new(target_object))

  yield
ensure
  block_binding.local_variable_set(symbol, target_object)
end

class PrivacyViolator
  def initialize(object_or_class)
    @object = object_or_class
  end
	
  def method_missing(method, *args)
  @object.send(method, *args)
  end
end

class C
  def foo
    puts "foo"
  end
	
  private
	
  def bar
  puts "foo"
  end
end

o = C.new()
disrespect_privacy(:o) do
  puts o.bar # works
end
puts o.bar # private method `bar' called