Where's The CRASH

This prank has to be where people walk all the time.... You start off by putting portable or wireless speakers that would play a playback of car tires skidding on the ground, in cylinder shaped trash cans right by a busy street full of cars and where a lot of spectators would walk or cross. Then step away and wait for a group of people or an individual to walk by the trash cans, then play the sound and watch everybody suddenly run or jump, expecting a car to crash somewhere....It's funny because of their reaction to a non-existing car crash.... My email is alexmosalmani@yahoo.com.