Improv Everywhere's Car Alarm Symphony Startles Staten Island Mall-Goers (VIDEO)

What happens when over 100 people set off their car alarms all at once?

For the infamous prankster collective known as Improv Everywhere's latest prank, a mall in Staten Island became the setting for an unlikely symphony. As leader Charlie Todd conducted his orchestra of agents, ready with their car remotes, horns blared and beeped in unison, totally freaking out the Staten Islanders who decided to get some shopping done that day.

One guy, pictured above, was actually pretty delighted by the chaos. Others, not so much.

Watch the video above and click over to Improv Everywhere to see how it was done!