module This
  def initialize(*args)
    @x = []
  end

  def oh
    @x.inspect
  end
end

class Person
  include This

  def initialize(name, age)
    @name = name
    @age = age
    super
  end
end

Person.new.oh

## using superclass

class Human
  def initialize(*args)
    @x = []
  end

  def hey!
    @x.inspect
  end
end

class Person < Human
  def initialize(name, age)
    @name = name
    super
  end
end