Players sit or stand in a circle, and "It" is in the middle.
He points his finger at someone in the circle and says either "Pipety-pop," or "Popety-pip." If Pipety-pop is said then the player that is pointed at must say pip before the entire phrase is said by the pointer. For Popety-pip, the person must say pop before the phrase is finished. If they do not say the correct word or do not say it in time then they become the person in the middle.