The best thing about this video is how at the beginning the TV announcer Len Kasper makes a quip about how it's so foggy that he'd love to see the Cubs batter Luis Valbuena hit a pop-up home run to the second baseman, who'll lose the ball in the fog, as Valbuena simply circled the bases. On the very next pitch, he virtually gets his wish.
As you'll see from the reaction of the outfielder, this is no doubt where they got the expression, "I don't have the foggiest idea..."