Sit the team around a table (ideally a round one) and stick post-its around the table to represent the fibonacci sequence of size (1,2,3,5,8,13). Place a story in the centre of the table, and each team member places there finger on it. In silence, the team “collaboratively” push or pull the story to the size they believe it represents.
Well formed, well understood stories move freely and easily. Poorly defined or misunderstood stories stay in the centre of the table – when this occurs the facilitator invites the team to break their silence and discuss before trying again.
Dominant team members will be revealed by their white knuckles, or by putting two fingers on the card instead of just one. Facilitators should be aware of this and highlight that to the team.
Great fun and a really fun alternative to planning poker. You can see this in action by viewing Ouija Board Estimation via YouTube