Mannequins are a normal part of any clothing store. As an ingenious prank, Improv Everywhere sent 40 people wearing white mannequin costumes to a Gap store on Fifth Ave in Manhattan.

They came in wearing regular clothes, and at the same moment all covered their faces with their white masks and froze still. Suddenly, the store was absolutely covered with waaay too many mannequins. 

The Gap didn’t take too kindly too the prank though, and called the police.