According to The Great One himself, during his main-event match against John Cena at WrestleMania 28, The Rock tore his hamstring.
If fans were wondering why they weren't quite seeing The Rock of old, part of it has to be blamed on several years of inactivity, but apparently, we can also blame a bad hamstring which hampered his performance near the end of the match.
The Rock revealed the information when he tweeted to help hype NBC's broadcast of WrestleMania 28.
Though the match was nearly over by the time Cena dove from the top rope at him, it's still impressive that The Rock made it to the final bell.
Like Triple H when he tore his quad during a tag team match on Raw in 2001, him toughing it out for the remainder of the match is a testament to his hardiness and to his respect for pro wrestling.
In retrospect, it explains why we saw a slower, less athletic Rock near the end. During the action though, it wasn't terribly obvious that he'd been injured. If anything, it just appeared that he was gassed.
Any critics of his performance have to reevaluate their position.
The Brahma Bull wasn't out of shape, he was wrestling on one leg.
He wanted to play out the scripted ending, giving fans what they had been waiting and hungering for. The Rock delivered that final Rock Bottom to Cena while his torn hamstring burned with pain.
The Rock later tweeted that "well earned success is worth the pain."
Of course, fighting through pain and working with a damaged body is a key component to being a WWE superstar. And even if The Rock is now nine parts movie star and only one part WWE wrestler, it's comforting to fans that the wrestler part of him is still very much alive.