A man found a technique to disperse young people who were going to fight. March 13, 2017, in the city of UFA in Russia, a man in his apartment downstairs from his home noticed a group of teenagers who was harassing a teenager. He decided to intervene by placing a speaker on the windowsill and played the sound of a siren to simulate the arrival of the police. Effective, because a few seconds later, the group dispersed and everyone has already left running.