ANyone remember the scene from Bronx Tale?
When all the bikers come in and try to fuck up that neighborhood bar? Then the Italians lock the doors and proceed to beat the living shit out of all those cocksuckers? Then fuck up their bikes on top of it?
But seriously, just if one these flash mob cocksuckers ended up with a bullet between the eyes with a pool of blood around him for everyone to witness...this shit would be highly curtailed.