All of the participants, except the first participant who is 'it', sit in a circle. 'It' walks around the circle, tapping each player on the head, saying “duck” each time until he decides to tap someone and say “goose.”
That person becomes the goose and runs after 'It', trying to tag them before 'It' can take the goose's seat. If 'It' successfully reaches the goose’s seat without being tagged, the goose is the new 'It'.
If the goose tags 'It', then the goose keeps his spot in the circle and 'It' must either continue to be 'It' for another turn or sit in the middle of the circle until another 'It' is tagged.