WTF Read Time : 1 Minutes Flash Mobbing Just Got Intimidatingly Scary With Flash ‘Haka’ Mobbing September 5, 2011September 5, 2011 YBMW Staff While most people caught in a flash mob get started initially, you never have to wonder if you’re in any danger. That is unless you were caught in this intimidatingly terrifying “Haka” flash mob.