Midknightsun
Explorer
If I gathered together all my monsters who got killed because I forgot about their spell resistance or DR, I'd... well, I'd have a whole lot of monsters.
Stupid minutiae.
Oh yeah. me too. I've forgotten more than I care to think about. I've forgotten buffs, cast spells with durations, feats, spell-like and supernatural abilities . . sometimes when I have a load of npcs on the board of different types I even forget their turns, though I usually catch this before the end of the round. Fortunately, it doesn't happen all that often, but when you're handling several npcs at once, it can be easy to overlook an ability or two.