Although the market is full of people who bet against it, short-selling is a fairly difficult and risky practice, said Jim Cramer on his "RealMoney" radio show Monday. An example of where short-selling is backfiring right now is natural gas. Natural gas is en fuego today as it has been for the last 10 days, he said. There are people who believed that natural gas would only go down because they thought that there was plenty of storage of it, but that notion is wrong, Cramer said. In fact, natural gas is difficult to store. In addition, the inventory of oil does not change the price of natural gas, he said. "We've been hot in this country for 10 straight days, and that's what's causing the surge of natural gas," Cramer said, adding that natural gas is up more than 50% in two weeks. The rally we are seeing in natural gas is for real, he said, predicting that Chesapeake Energy ( CHK), which was recently at $33.20, will go up to $35 and Devon Energy ( DVN), which Cramer owns for his charitable trust, Action Alerts PLUS , will go from $64 to $70. Referring to an interview he recently caught on a Bloomberg weekend wrap-up program with a Texas Instruments ( TXN) executive, Cramer advised investors that although everybody has turned negative on the tech sector, there might be some money to be made in cell phones. When the interviewer asked the executive about cell phone sales, the executive said that there has actually be an acceleration in business for its three main customers: Nokia ( NOK), Sony Ericsson and Motorola ( MOT). Cell phones are better than TVs and PCs, Cramer said, while recommending that his listeners keep an eye on cell phone companies. While people might believe that the current situation is favorable for retail stocks, Cramer said they are a horrible place to be if we get into a recession, which could possibly happen. People are not spending less at the pump, so there has consequently been a cutback in retail, Cramer said. If market players believe that the back-to-school season is going to be good, he said J.C. Penney ( JCP) is the way to play it. To see the most recent edition of The RealMoney Radio Recap in its entirety, please click here. This recap is published every day around 3 p.m. ET.