Love those wacky guys at MIT.
(Bear with me. First time posting a thread.)
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The MIT guys do this sort of thing every once in awhile. For the premiere of Star Wars Ep. I, they made it R2D2, and once they put a full-sized police cruiser, complete with a dummy police officer and a box of donuts.
For the complete list of all these, and pictures for most of them, check out:
http://hacks.mit.edu/Hacks/Gallery.html
(Wheh. Hope this works.)