The markets' worry over the possibility of a Brexit - that the United Kingdom may actually pull the trigger and leave the world's biggest economic bloc - has been driving volatility for weeks.
Here's the thing... For all the coverage and attention the Brexit is getting, no one's talking about the most frightening prospect - by far - that's going to happen if Britain exits the European Union.
I addressed it on FOX Business' "Making Money with Charles Payne" last Wednesday and got Charles to admit he hadn't heard anyone ever discuss it.
Well, that's because no one's thought about it. Make no mistake - this possibility is out there, and it's the ultimate black swan.