Nine strangers are locked in a bunker and told they cannot leave until they unanimously choose to award one of them the grand prize money.
There were even cases in which Member States in the minority, rather than invoke the Luxembourg compromise during a vote, have challenged it in the Court of Justice on grounds of an incorrect legal basis – arguing that an article requiring unanimity should have been used.
When the bishops teach something with unanimity, they are referred to as the ordinary and universal magisterium; see Infallibility of the Church, and Magisterium.