In the Season 5 premiere of It's Always Sunny in Philadelphia , " The Gang Exploits the Mortgage Crisis ," the group attempts to profit from the 2008 housing market collapse through failed real estate and surrogacy schemes. Frank buys a foreclosed home only to have the residents remain, prompting Dennis and Mac to pose as realtors to force them out, while Dee's surrogacy plot ends with her being rejected by the parents, culminating in the gang taking over the couple's pool. You can watch this episode on FXNOW or Hulu.