A very short post today.
In B/X, the rules specify rolling for wandering monsters every other turn in the dungeon, with a 1 on 1d6 indicating that an encounter will take place next turn. For whatever reason, I always had trouble with this "every other turn" procedure. I'd forget whether I had rolled or not last turn; sometimes I ended up rolling several turns in a row, and sometimes I'd skip several turns, distracted by more pressing matters.
Well, wait a second - we've got that seldom-used d12 just lying around. How about rolling every turn, with a 1 on 1d12 indicating an encounter? The odds aren't quite identical, but are within 1% of being equivalent to 1 on 1d6 every other turn, and it's one less thing I have to remember from turn to turn at the game table.