Not all flash mobs are cute little T-Mobile get togethers at Liverpool Street Station, oh no, they can sometimes be used for organising a mass robbery.
Definition of flash mob:
The term flash mob is generally applied only to gatherings organized via telecommunications, social media, or viral emails.
Check out the video below where 60 high school students rushed a grocery store. Pretty crazy scenes.
This is no where near as good as the flash mob decoy set up by a bank robber to fool a crowd of unsuspecting, identically-dressed, accomplices off Craigslist. Awesome.
History of flash mobs here.