Rey Mysterio's mask is one of the most famous traditions in wrestling.
The former Cruiserweight champion has, for the majority of his career, worn a mask, apart from his stint in WCW in the late 90's and early 00's.
It is seen as the most sacred possession in Lucha Libre, so to have yours taken away can cause outrage, just like it did on this week's episode of Monday Night Raw.
The former Cruiserweight champion was exposed when he came up against Andrade in a Gauntlet Match.
His old rival 'accidentally' ripped off his mask, showing his face to millions watching at home.
Mysterio quickly tried to cover his face, but cameras caught a rare glimpse of his appearance in the ring.
This is one of the great crimes in Mexican wrestling. Bah gawd.
Andrare got the pinfall over Mysterio but after the match, Rey said he wants payback.
"I can't live with that weight on my back forever." he said. "This was just one bad night that happened.
"Even though the circumstances were a bit horrible because the only [people] that have ripped my mask before in the past was Eddie Guerrero and Randy Orton.
"Now Andrade took it overboard. I have two main goals in mind right now: First get that US title back, and second take care of Andrade for what he did tonight."
You can't just rip Rey Mysterio's mask like that?!