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Extremely frustrating. Didn't obey any of the laws of physics that I learnt at school. Also, I should probably also add: don't upload movies to NG if they're not your own work. I can't find the FAQ page that said it, but it basically said, if a Flash isn't your own work, get the original author to submit it.
Oh yeah, here we go: from the FLASH SUBMIT page, which you viewed when you were submitting this swf:
Your movie must not be someone else's work! We will delete your account as punishment.
If you see something you like elsewhere, ask them to submit it, or notify us.