gistfile1.txt

require 'rubygems'
require 'grackle'

client = Grackle::Client.new(:auth=>{:type=>:basic,:username=>'lpgauth',:password=>'password'})

while true do
  begin
    if client.users.show?({:screen_name=>'soundcloud'}).followers_count == 24999
      client.friendships.create!({:screen_name=>'soundcloud'})
      break
    end
  rescue Grackle::TwitterError
    # noop
  end
  sleep(30)
end

Logs of number of followers GMT-5 for user SoundCloud:

07:26:40 : 24997
07:30:44 : 24997
07:31:14 : 24997
07:31:45 : 24997
07:32:15 : 24997
07:32:46 : 24997
07:33:17 : 24997
07:33:47 : 24997
07:34:18 : 24997
07:34:48 : 24999