# Add some methods to all strings.
class String
  def says(something)
    @body = something
    rebuild
  end

  def to(someone)
    @to = someone
    rebuild
  end

  def in_anger
    @punctuation = "!!!"
    rebuild
  end

  def rebuild
    @punctuation ||= "."
    @from ||= self.clone
    @body ||= ""
    @to   ||= ""

    self.replace(@body)
    self << ", " unless @body.empty? || @to.empty?
    self << @to + @punctuation
    self << " Sincerely, #{@from}." unless @from.empty?
    self
  end
end

# Say some stuff!
puts "Justin".says("Hello")
puts "Justin".says("Good bye").to("Kevin")
puts "All of Florida".says("Fuck off").to("hurricanes").in_anger

# Outputs:
# Hello. Sincerely, Justin.
# Good bye, Kevin. Sincerely, Justin.
# Fuck off, hurricanes!!! Sincerely, All of Florida.