Rrrmrrrmrrrfrrrmrrr or Consequences

Rrrmrrrmrrrfrrrmrrr or Consequences is an Omicronian ritual in which the submitted being must choose between two people by killing the one he or she rejects. As the Omicronians, a 14-billion-year old race, consider it to be ancient, we can assume it's an extremely old tradition, although its up to speculation as to exactly how old it is. It's apparently meant to be performed on floating white platforms in the sky, though if and why they are a necessary part of the ritual, or even where these white platforms can be found, are all uncertain.

Ndnd invoked the ritual after realizing Leela had been nagging, torturing and pushing around Lrrr, her husband, and therefore doing her job. She took everybody to White Planes in New New York so they could begin Rrrmrrrmrrrfrrrmrrr or Consequences. Lrrr was willing to shoot Leela, but Fry jumped in front of the disintegrator ray, so she didn't get shot. As a result, Ndnd was surprised Lrrr actually did value her nagging above all others, and the Omicronians went home.

Trivia

 * There's a home version.
 * The  animated TV series episode features a similar-looking ritual.
 * The name of the ritual is an allusion to the quiz show or, ultimately, the  party game.