How to make this duck quack for both its data and behavior messages?

prepare_duck.rb

module Preparable

	def chat
		puts "Hi"
	end

	def speak
		puts "there"
	end

	def say_again
		puts "I said #{chat} #{speak}!!" #evaluation order is #thing, #speak, then #say_again??
	end
end

#============
class Foo
	include Preparable

	attr_reader :bar, :baz

	def prepare(*fooey)
		fooey.each {|f| f.prepare_duck self}
	end

	# def speak
	# 	puts "foo"
	# end
end

#============
class Bar
	include Preparable

	#Implement duck interface
	def prepare_duck foo
		foo_bar  = foo.bar
		# return foo_bar
	end

	# def speak
	#   puts "bar"
	# end
end

#============
class Baz
	include Preparable

	#Implement duck interface
	def prepare_duck foo
		foo_baz  = foo.baz
		# return foo_baz
	end

	# def speak
	#   puts "baz"
	# end
end

f = Foo.new
f.prepare @bar = Bar.new, @baz = Baz.new

@bar.chat
@baz.chat
@bar.speak
@baz.speak
@bar.say_again
@baz.say_again