A Meckel's Diverticulum is a remnant vitello-intestinal duct present in the embryo. It is the commonest congenital anomaly of the GI tract being present in 2% of autopsies. This is a case of an adult male patient presented with pain around the umbilical region which later shifted to the right iliac fossa. In face of such classical history and other signs and symptoms, clinical diagnosis of Acute Appendicitis was made, but, intraoperatively it turned out to be an inflamed Meckel's Diverticulum.