#5 Shane's lockbox
When Shane McMahon returned to the WWE, everyone (including myself) was ecstatic. Shane hadn't been seen in the company for nearly a decade, and though fans may have gotten sick of him in 2019, the son of the boss promised big things upon his return.
Wanting to take control of Monday Night RAW, Shane's request was blocked by his father Vince, though Vince gave his son the chance to earn the title of RAW GM, if he could defeat The Undertaker at WrestleMania.
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The reason for Vince's sudden change of heart, was a lockbox Shane had in his possession, which contained something of great importance to the Chairman of the Board. Unfortunately, the story of the lockbox was dropped pretty much immediately, as once Shane got his match, the mysterious package was never mentioned again.
The story also didn't explain why The Undertaker, who had been at odds with Vince in the past was so willing to work on his behalf. Once Shane lost the Hell in a Cell WrestleMania match, the lockbox was never mentioned, and we don't know whether Vince was able to acquire what it held.