Murrayball is a secret minigame found in Escape from Monkey Island.
It is similar to the game 'Pong', the main difference being that in place of a ball is the head of Murray the Demonic Skull.
Have Threepwood approach Murray outside Planet Threepwood.
Spin Murrays stool and listen to what he says. Keep on doing this until he begins to repeat himself.
Turn around to face away from Murray then type 'Murrayball' on the keyboard.
If done correctly, the game will begin.