Carnival Corpse

Carnival Corpse (死肉祭, Kānibaru Kōpusu) (also referred to as Corpse Carnival or Carnival of Corpses) is a game very similar to gladiator battles in the coloseum in Rome. The similarity is the sick, brutal battles that are viewed upon as entertainment. In this case, the gladiators are Deadmen, and before each battle, the viewers take bets on who will win.

The names of the participants are changed to aliases, after birds. For example, Ganta was granted the title Woodpecker, Minatsuki was given the title Hummingbird, Toto has the title Mockingbird, and so on. Every alias hints to an ability or character-trait of the Deadman.

Owl vs his unnamed wife
Sometime in the past, Owl had to battle his wife, who was also a Deadman. Since she was carrying a child, he couldn't bear to injure her and lost on purpose. Owl made a deal with Tamaki that if he went down, there weren't going to be any consequences for his wife. Tamaki however, didn't keep that promise and ordered Genkaku to murder Owl's wife. Owl went on a rampage after that, killing a lot of Undertakers.

Aftermaths
The loser of the battle, if still alive, will face a Penalty Game. He or she is sent to a special room where a slot machine decides what will be removed from the loser's body. There are several variations to what the doctors remove, ranging from organs to limbs and even hair. Known Deadmen who underwent this are Nagi (lost his vocal cords), Senji (lost his right eye) and Minatsuki (lost a part of her stomach, kidney and hair).

The winner is granted CP, Candy and a trophy.

Trivia
The name "Carnival Corpse" seems to be a play on the name of American grindcore band Cannibal Corpse. This is in keeping with the overall "heavy metal" feel of the series, given that much of the music seems to be re-tooled versions of contemporary heavy metal songs. Such covers include;
 * "Raped by the Beast" by Cannibal Corpse (played during the beginning of every Carnival Corpse)
 * "The Beautiful People" by Marilyn Manson/"Loyalty" by American Head Charge (during the start of the Crow vs Woodpecker fight)