#3. Vince McMahon booking "Once in a Lifetime" twice
WrestleMania 28 was the first and only time that a main event was announced a full year in advance. When The Rock was announced as the host of WrestleMania 27, nobody outside of a small circle knew that his contract was for three WrestleMania appearances.
Despite this, Vince McMahon used the opportunity to market the WrestleMania 28 main event between The Rock and John Cena as "Once in a Lifetime" knowing that they would have a rematch a year later.
WrestleMania 28 was a massive success, and Vince McMahon's marketing paid off as the pay-per-view garnered 1.217 million buys - the highest in WWE history. They faced off a year later at WrestleMania 29.
Given that CM Punk's 434-day WWE Title reign ended for this main event to be set up, it was an unpopular decision that Vince McMahon made. Thankfully for him, he stuck to his guns and didn't add CM Punk to the match. This resulted in WrestleMania 29 getting 1 million pay-per-view buys - down by 200,000, but still a huge number regardless.