Enjoyed Evangelion enough to watch rebuild of evangelion too? Insanely cool effects and a good (if not as depressing as the original) story(it's an alternate universe(probably))!
Ievan polkka, literally meaning the polka of eva, is about a girl who wants to dance with a boy, but her parents won't allow it, in the end, the boy convinces her to run away with him, giving a big F you to the parents at the same time. The leek spinning comes from a small segment of the music which is utter gibberish http://www.youtube.com/watch?v=1ygdAiDxKfI&feature=related
ITS IEVAN POLKKA!!!(starting with an i) DEATH TO THE MISPRONOUNCER WHO ONLY KNOWS IT AS THE LEEK SPIN THINGIE!