Cam and Mitch went on vacation to celebrate their Honeymoon and brought back gifts to the family. For Jay, they brought a cheesy golfing frog statue, but also with an illness. Jay views the frog statue so poorly that considers it possible the illness is a better gift. Economists like to discuss irrationality of gift giving because we often spend money on gifts for people at a higher value than they would spend on themselves. A second concept at play in the clip is that Cam & Mitch’s trip to Mexico added additional costs on the family through the spread of an illness. Had Mitchell known he would have gotten the family sick, he may not have left.