module Debug
  def whoAmI?
    "#{self.type.name} (##{self.id}): #{self.to_s}"
  end
end
class Phonograph
  include Debug
  # ...
end
class EightTrack
  include Debug
  # ...
end
ph = Phonograph.new("West End Blues")
et = EightTrack.new("Surrealistic Pillow")

ph.whoAmI? → "Phonograph (#537766170): West End Blues"
et.whoAmI? → "EightTrack (#537765860): Surrealistic Pillow"