Survivor (American TV series)
Before the use of a Final 3, the jury has always been odd-numbered, ensuring that no tie would be possible.  However, with every Final 3 jury, or as in the case of Micronesia of an even-numbered jury for a Final 2, a tie may be possible; it is unknown what tie-breaker is used to break a tie if it happens.  During the finale of Micronesia, the host had a white envelope that he said held the tie-breaker, but its contents were not revealed as there was no tie.