http://gifzo.net/BJyOGF6u0JE

skype_blink.rb

# coding: utf-8
require 'mac-skype'
require 'mac-skype/Ruby4Skype'

def main
  text, blob = ARGV
  blank = '​'

  Skype.init
  Skype.attach_wait

  chat = Skype::Chat.find_using_blob(blob)
  msg = chat.send_message(text)

  # https://twitter.com/youpy/status/528042270088364032
  1000.times do |i|
    sleep 0.5
    msg.set_body((i % 2).zero? ? blank : text)
  end
end

main