During a recent training course I ran, one of the delegates made a joke about the nature of agile estimation in Scrum teams resembling a "séance"; whereby the team gathers around the table and stares at a number of user story cards expecting something unnatural to happen. How true! This gave me an idea for a different type of iterative estimation that I tried in practice with ‘Team Woodstock’. I sat the team around a table and wrote the Fibonacci sequence’s numbers “1,2,3,5,8,13” and a “?” on post-its around the table in the design of a Ouija board.