Donkey Kong's 30th birthday
http://technologizer.com/2011/07/10/donkey-kong-anniversary-2/
also:
http://www.gamasutra.com/view/feature/6422/the_secret_history_of_donkey_kong.php
also:
http://games.slashdot.org/story/11/07/11/2018208/30th-Anniversary-of-Donkey-Kong
also relevant:
Don Hodges fixes the Donkey Kong 'kill-screen' bug that causes the arcade game to kill you on level 22
(relevant icon)