I've come across time lapse videos on YouTube before, but I went there a few minutes ago, and this one was advertised on the front page
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http://youtube.com/watch?v=zyyCcjbrWOM -
quite a bizarre time-lapse video of a load of hot air balloons being set up, flying around the sky and coming back down again - a period of several hours condensed into one minute and 9 seconds - it really is well worth a watch (although I haven't sold it very well!).
I thought it had been mocked up at first, until I realised the person who's put it on there has a load of other time lapse videos here -
http://www.youtube.com/profile?user=tlapse