This year's Rube Goldberg contest requires that the team build a device to remove the old batteries and insert new batteries in 20 or more steps.
The winning team, from Purdue took 125 steps.
A Quicktime video of their machine can be found here. The /. article for this didn't have the full movie, but Valorie forwarded it from the Destination Imagination mailing list.
Edit: Fixed spelling
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