Japanese shmup end boss... FROM HELL
Check it out:
http://www.dorkly.com/video/1914/most-insane-boss-fight
WOW... and I thought the end bosses for http://en.wikipedia.org/wiki/Forgotten_Worlds were tough (at least the first time) but this video totally reminds me of that game (http://www.google.com/images?q=%22forgotten+worlds%22+bosses)... and R-Type, of course.
Man! So many memories!!
My fave boss of all time is:
http://www.shmups.com/reviews/gokujyouparodius/images/image041.gif
It shoots a deadly, nearly unblockable stream of POWER UPS!!