On the 5th anniversary of the 9-11 attack, a fire truck was put on the dome of MIT, on the last day of class in 1994, a replica campus police cruiser was put on the dome

at night the red dome light lit up

http://hacks.mit.edu/Hacks/by_year/2006/firetruck/

The car turned out to be the outer metal parts of a Chevrolet Cavalier attached to a multi-piece wooden frame, all carefully assembled on the roof over the course of one night.

The hackers paid special attention to detail. Not only had the Chevy been painted to look just like a Campus Police car from all sides, but a dummy dressed up as a police officer sat within, with a toy disc gun and a box of donuts.

The car, numbered ``pi,'' also sported a pair of fuzzy dice, the license number ``IHTFP,'' an MIT Campus Police parking ticket (``no permit for this location''), and a yellow diamond-shaped sign on the back window proclaiming ``I break for donuts.''