The New York prank collective Improv Everywhere recently organized what it called a Car Alarm Symphony, with a video cruising the internet now.The New York prank collective Improv Everywhere recently organized what it called a Car Alarm Symphony, with a video cruising the internet now. The group has become internet-famous for filling a Best Buy with employee clones and for stopping time in Grand Central Terminal with hundreds of strangers turning into frozen living statues. This time, the group gathered 100 volunteers to park their cars outside a shopping mall. Each driver then hid behind a wall and simultaneously pressed their panic buttons. A blasting, dissonant chaos ensued…