One classic hack involved a police car with its flashing warning lights operating. The unusual aspect of this hack was its position—on top of MIT's Great Dome. The car was found to be a gutted, junked, heavy Chevrolet, painted meticulously to match the MIT Campus Police patrol cars. The car's number was pi. Its license plate read "IHTFP", the abbreviation for MIT's unofficial slogan. A dummy dressed as a campus patrolman was seated inside with mug of coffee and a box of donuts. Some years later, the police car has now been semi-permanently re-installed in the Stata Center as an all-time classic.