I have often said to trainees “if you are doing the same operations when you retire that you were doing when you started it is likely a sign of failure.” It was a disappointment in my own results of lipoma surgery that resulted in one of my most enduring collaborations. Following the publication of his results of “total and near total resection of lumbosacral lipomas,” I was fortunate enough to be permitted a sabbatical with Dachling Pang in 2011. I arrived in Oakland, California, with a healthy combination of enthusiasm and skepticism. The trip proved to be a career-altering endeavor. Many hours, both within and without the operating room were spent with Dachling and his partner, John Zovikian, discussing cases and learning the nuances of the technique that they had pioneered and refined. I began to look more optimistically at a condition that had previously felt elusive. The collaboration has endured, Dachling “retiring” to London joined us on the staff at Great Ormond Street. I continue to learn with each complex (and lengthy!) case that we do together and relish the opportunities that come with joint operating—an important reminder that, contrary to the English proverb, “Old Dogs can be taught new tricks.’’