Choose a group leader. The group sits in a circle and chants "Ali baba and the 40 thieves" while doing an action such as snapping fingers, touching your nose etc. The group leader changes the action on the next beat and the person to the right does that same action on the next beat. The action follows its way around the circle while the whole time the group is repeating the phrase. The group leader must change the action after every beat, so that every person in the circle eventually ends up doing a different action. This may be compared to singing a song in a round.