"Hurricanes can't make you money. That trade never works," Jim Cramer said Friday on his "Mad Money" TV show. "But, you can always make money off of people acting stupidly. You've got to own Montpelier Re Holdings ( MRH) because people always sell good insurance companies during bad weather. It's just the kind of knee-jerk stupid stuff that happens every September, every August, right around now," said Cramer.