I did that to someone at Intel many years ago. It was a 9x9' cubicle with 5.5' walls. I first sealed the door and put in a layer of paper about 2' high, then put helium balloons under that. Air-filled balloons went on top of the paper to the top of the cubicle, then I pulled the layer of paper out. The air-filled balloons held the helium ones underneath until he came in and started rooting around, then all the helium balloons got loose.
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I wish my office-mates were in such good spirits :)
Thanks for creating such a cool Vox design too - I'm using it on my vox blog :)