Flash mob
The term "flash rob" or "flash mob robberies", a reference to the way flash mobs assemble, has been used to describe many robberies and assaults done by groups of teenage youth. Bill Wasik, originator of the first flash mobs, and a number of other commentators have questioned or objected to the usage of "flash mob" to describe criminal acts. Flash mob has also been featured in some Hollywood movie series, such as Step Up.