#4 Brock Lesnar changed the ending to his own match
Most wrestling fans are aware that outcomes are predetermined by Vince McMahon and the creative team. The WWE Chairman has the final say on everything, but McMahon is also known for changing his mind at the last minute, nixing all the plans for the outcome of a major match in favor of another finish suggested by a top star.
This was the case back in 2018 at WWE SummerSlam. Brock Lesnar dropped his Universal Championship to Roman Reigns at the event after attacking Braun Strowman who was standing at ringside with his Money in the Bank contract. Jon Moxley, however, revealed in an interview that was not the original plan for the finish.
Moxley stated that The Shield was supposed to reunite after preventing Strowman from cashing in his Money in the Bank contract on Roman Reigns. However, Brock Lesnar arrived early that night and pitched his idea to Vince McMahon of how things should transpire, which McMahon agreed to.
“Brock comes in at 6pm and changes everything. And Vince is like, ‘Okay, we’re gonna go with Brock’s idea,’ and it made everybody else look stupid except Brock, and the writers are just sitting there watching it in a room and they’re just like, ‘Come on, we had this great ending to the show...’”
The Shield had their reunion the following night on RAW, but there's no doubt that The Biggest Party of the Summer would've been a more memorable event if it hadn't been for Brock Lesnar.