I learned this from a student at Meiji University.
One person sits in the middle of the room surrounded by the other participants. S/he asks the group to think of one thing -- for example, their favorite musician. On the count of three, everyone calls out their answer at the same time. The person in the middle, who can ask the group to repeat their answers if necessary (again, all at the same time), listens carefully and then names all the musicians s/her heard, checking who said it. If s/he correctly hears all the items, s/he can choose the next person to sit in the middle.