When my sixth grade covered this topic, the homeroom teacher came up with an activity that worked fairly well. First of all, the students have 'teams' in their class anyway, so they got together with their teams. Then they decided who would go 1st, 2nd, 3rd, 4th WITHOUT knowing what the questions were going to be. One would come forward from each group, and they'd compare their height, strength (arm-wrestling), hair length (pull a single strand of hair and tape each to the board to compare lengths), and . . . I've forgotten the next question. It might have been hand size.
Anyway, the students were really into it, since the team members they would have chosen if they'd known the question were rarely the ones that were at the front of the room when the question was revealed. For instance, one unlucky team sent the shortest person in the whole class for the height question. The whole class thought it was incredibly funny.
