My players were fighting a Devil-Bat from the old Judges Guild Module "Glory Hole Dwarven Mine" tonight.
The thing had a weird mechanic for saves vs. its fire attack. It says: "The target of the attack is allowed of the average of all abilites or lower on a 3d6+3. A successful saving throw results in only 2-8 points of damage."
It like a throwaway cool alternative saving throw mechanic, in a monster/module that probably 19 people in dnd history even remember. I like it. Making saves an avg of our ability scores is so much better than basing them on class, imho. If I were to adopt it, I would say that classes can give bonuses to types of saving throws, but nothing else.
Also of note is the part where the 2-8 dmg if you make the save. What's different about this is that it's not the traditional 1/2 dmg, as the full attack does 3-12. It's a 2/3 dmg if fail.
Cool new alternative game mechanics, sitting there in the monster description hardly anyone knows about. Fuck yeah.