In addition to “Brett Favre’s Steakhouse” in Wisconsin and his spokesperson work for Wranglers and Sears, the veteran quarterback recently ventured into the high-risk world of finance. Little known fact: Brett Favre actually invented the “Reverse Mortgage.” Perhaps you’ve seen the ads on television. What is a reverse mortgage? Instead of paying a 3.5% interest rate for 13 years, you pay a 5.3% interest rate for 31 years. The increasingly wealthy quarterback has sold many of these toxic mortgages to teammates, who signed the paperwork before reading the fine print. “I’m saving up for retirement,” Favre recently confided to his accountant.