something.rb

class SomeService
  def initialize(some_dependency)
    @some_dependency = some_dependency
  end

  def some_event(value)
    @some_dependency.another_event(value.increase_value)
  end
end

class SomeValue
  attr_accessor :counter
  def initialize(counter)
    @counter = counter
  end

  def increase_value
    SomeValue.new(@counter + 1)
  end
end

There's no way this example is understandable without Foos and Bars.

;)