Day 24: Favorite House Rule
My house rule was in Savage Worlds, where I like to use bennies - in addition to the generic re-rolls and damage soaks - as a pseudo fate chip. You can use them to change the course of events in some (relatively minor, but possibly important) way.
In by Distress on Life Liner 928 (Star Frontiers / Savage Worlds) game, because the game often has to end due to time constraints, I have the players spend bennies, back and forth, to get their agendas met (or not met, depending on who's got more bennies). This allows the game to be tied up in minutes, since it becomes all narrative at that point, and has led to some fun player vs. player moments. It also means that players get to spend all their bennies by the time the game ends, so it never feels like you wasted them, which is an additional bonus.