#2. Chris Jericho
Former WWE Champion Chris Jericho was watching the previously mentioned match between Randy Orton and Brock Lesnar at SummerSlam in 2016 from backstage - and wasn't a fan of how the match ended, to say the least.
Lesnar was awarded the bout by TKO, having legitimately busted Orton open with some hard strikes.
Current AEW star Jericho believed that Lesnar had gone into business for himself and been reckless with Orton, potentially giving him a concussion. Jericho asked Michael Hayes and a number of other WWE officials who were present at the time whether or not the TKO was the intended finish of the match, but there was no response.
This led to Jericho confronting Lesnar - who then shoved Jericho - and the two men seemingly preparing to fight before they were separated by Triple H and Vince McMahon.
Jericho then explained why this historic WWE altercation actually happened when he appeared on SiriusXM show Jim Norton and Sam Roberts, back in 2019.
"[Lesnar] did some stuff that I felt he shouldn't have done, and no one would tell me if it was supposed to happen or not. Then he started yelling at me, and I was like 'f*** this guy' and started yelling back."
Cooler heads eventually prevailed, but the fact that Lesnar was able to rile an experienced veteran like Jericho says a lot about how easily 'The Beast' can generate heat with his fellow WWE performers.