#2 CM Punk's firing and departure

CM Punk is arguably one of the most controversial Superstars in WWE's modern history. Having made a special place in the heart of the fans for his straight-edge attitude, he was one of the biggest stars of the company right before he left it in 2014. What was assumed by many at the time to be an extended storyline turned into a huge situation for the company and its reputation!
On one hand, the WWE Universe was hijacking segments and shows with CM PUNK chants and on the other, the Superstar himself was starting to get vocal about the circumstances around his departure. Things took an uglier turn when Punk revealed that he was fired on the day of his wedding.
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The day of my wedding I got a FedEx in the mail. It was my termination papers. I was fired.
With the entire situation between the two parties, the lawsuit, the staph infection, and whatnot, it seemed like we would never see him back with the company again. But that wasn't the case to be as the Best in the World (not you, Shane) made his return to the company in late 2019 as an analyst on WWE Backstage. Whether we'll see him inside the WWE ring again is a question yet to be answered, but the company would surely want to fix the broken bridges and work out a healthy working relationship with him again.