UCLA Fire Alarm

Origin
On college campus', during the week of finals, the dorms have set "quiet hours" so that people can study without being disturbed. Tradition has it that on the last night of the finals at 12:00 am everyone opens their windows and screams for exactly one minute. Many campus' tell a warning about this tradition stating that several times over the life of the college a person, usually a female, is brutally raped and/or killed between 12:00 and 12:01am. The fear of this very thing occurring was imbued into this fire alarm that was located in a poorly lit area of the University of California Los Angeles so that whenever a crime was committed the alarm would sound not to call out for help but to cover up the screams of the victim.

Effects
Goes off whenever a crime is being committed to cover it up