When Jim Cramer showed up at the New York Stock Exchange on Friday morning and saw a line of media trucks sitting out front, he knew the market would be in panic. Historically, he only sees news trucks appear when there is a panic, typically after the bottom of a big decline the day before.

By the end of the day, the Dow Jones industrial average closed down more than 600 points. What was strange to Cramer, though, was that the U.S. market was down worse than the U.K. How the heck could that be possible if only a handful of Americans actually have significant exposure to the U.K.?