So when the Today show staged a flash mob earlier this month, it had the effect of beating a dead horse.
This effort is admittedly less “flash mob” and more “stand and sing on the subway.”
a group of people who organize on the Internet and then quickly assemble in a public place, do something bizarre, and disperse; also called inexplicable mob
Organizing a flash mob involves emailing a group with instructions to show up at a certain place and time to do something and then disappear.
origin was event called Mob Project
flash-mobber, flash-mobbing n