We dont have to reach back far for this history-making moment. At WrestleMania XXXI this March, the main event between Brock Lesnar and Roman Reigns was humming along, with Lesnar throwing Reigns around and Roman laughing in the face of an absolute a**-kicking. It was a perversely entertaining match that would get a whole lot better. With both men down, Seth Rollins came flying out of the back and handed his briefcase over to ref Mike Chioda, turning the world title match into a triple threat. About a minute later, Rollins scampered out of the ring with the WWE World Heavyweight Championship in his hands. This cash-in was so unique because it actually happened during a match rather than after, which is the typical method. Its doubtful that well see something like that again, because a cash-in mid-match is risky with a second opponent to worry about. In this case, however, it made for a truly memorable moment.