#1. Braun Strowman turning heel
Braunn Strowman was the biggest babyface on RAW. He was getting cheered wherever he went. Fans wanted him to dethrone Lesnar at Wrestlemania. The entire WWE universe was behind Strowman throughout 2018.
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Heading into Hell in a Cell 2018, rather than having a feud where the fans decide whom to cheer for, WWE decided to force Strowman as the bad guy and Reigns as the good guy. They had him team up with Reigns to take on Ziggler and McIntyre and turn on Reigns midway into the match. Any results other than the monster coming on top will most definitely destroy his character and make it tough for WWE to build him back again.
Edited by Emeka Monyei