Hopefully those two Japanese dudes don't mind me using their song. Their video is really nice, but this song just clicked when I remembered these clips I had lying around. You can find their video at http://www.youtube.com/watch?v=BQ9YtJ... . Go watch it, they probably put in more work in their video than I have in mine.
This video's just intended to showcase a fun thing you can do in TF2. Discussions of skill and such are pretty much irrelevant. But if you have to ask, none of them were staged.
The shots where you can see the engie through a free camera were made with SourceTV demos.