#2 Seth Rollins tried to break Edge's neck
There was once a time when Seth Rollins was one of the most hated men on Monday Night Raw, the former World Champion broke up The Shield and then sided with The Authority before they were taken out of power by John Cena at Survivor Series 2015 (with the help of Sting).
Cena was the only person who could reinstate The Authority and he agreed to do so when Rollins took Edge hostage and threatened to curb stomp him on the briefcase which would definitely have paralyzed him. At the time, there was nothing Edge could do about his predicament since he wasn't cleared to wrestle at that time, but being a special guest referee is quite safe and Edge could get some revenge if he's able to cost Rollins his Universal Championship tonight instead.