People are assigned as prosecutor, defender, defendant, witnesses, and judge. Defender and prosecutor may present items as evidence, and point out contradictions between the evidence and a witness's testimony, which the judge may then accept or deny. Once either side has pointed out five contradictions in their favour, the judge may give a verdict.
Just a random idea, court trials.
People are assigned as prosecutor, defender, defendant, witnesses, and judge. Defender and prosecutor may present items as evidence, and point out contradictions between the evidence and a witness's testimony, which the judge may then accept or deny. Once either side has pointed out five contradictions in their favour, the judge may give a verdict.