When it comes to building wondrous contraptions with humble Lego bricks, Youtube user akiyuky doesn't like to mess around. His latest device employs dump trucks, a train, multiple Ferris wheels, a robotic crane, and a few hundred soccer balls and basketballs. But to what end? You'll have to watch to find out.
It isn't technically a Rube Goldberg device, as it doesn't actually accomplish anything. But it's still quite the spectacle to watch. A bit of programming care of the Mindstorms kits keeps everything humming - and it's certainly more work than anything I've ever built.
If you're aching to learn more (and can read Japanese), hop over to Akiyuky's blog to see more.