#2. Paul Bearer
Back in the early and mid-1990s, there were a handful of things you could put your house on in WWE.
You could be sure, for instance, that Bret Hart would say in any given interview that he was 'The best there is, best there was, and best there ever will be.'
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You'd be right to assume Vince McMahon would claim 'What a maneuver!" during any commentary of his. Perhaps the most significant certainty of them all, however, was that Paul Bearer would be found at the side of The Undertaker. That was, until he wasn't...
Undertaker and Bearer had been a duo more or less ever since 'Taker joined WWE, barring a brief stint managed by Brother Love. Bearer guided the Deadman to the WWE title in 1991 and, a year later, was at his side when he won in front of 80,000 fans at SummerSlam in London.
In 1996, though, one of the most dastardly heel turns of the era took place when Bearer turned his back on his long-time ally. It happened at SummerSlam 1996 when Undertaker was battling Mankind in a Boiler Room Brawl.
The winner was to be the man who reached the ring and gained possession of the sacred urn, held by Bearer. That looked set to be 'Taker until, inexplicably, he struck The Phenom on the head with it before aiding Mankind to the win. Fans were dismayed.
The two would be reunited once again before Bearer's death in 2013, but that incredible turn of events in 1996 won't be soon forgotten.