Mid-2011 when he turned heel on Raw one week. Then he just went on a rampage and started his awesome "Hall of Pain" run. Dominated the shit out of everyone, including the likes of Sheamus. Won the WHC from Orton. Had some great matches with Big Show, and some awesome TV bouts with Daniel Bryan. Then he got injured
. Then had some awesome TV matches with Punk, then had to get his injury sorted out. Now he's back
Though he has shown signs of this kind of greatness in the past. 06 SD against the likes of Rey and Benoit, 03 Raw against GOLDBERG, 08 ECW title run... but injuries, random face turns and shitty feuds/pairing him with guys he had little chemistry with, prevented him from fully unleashing the BEAST within.