As you should know by now, Seth Rollins cashed in his Money in the Bank contract to make the Brock Lesnar vs. Roman Reigns WrestleMania 31 main event a triple threat match. It ensured that Rollins could win the WWE world heavyweight title without Lesnar having to take a pinfall defeat.
It also led to this awesome moment:
Yes, that is Rollins thanking Reigns as he was pinning him to win his first WWE world heavyweight championship, one that was originally supposed to go to Reigns. Just one friend doing the honors for another.