CRG said:This happens so often with us...we keep a book of grudges. Every time something happens, we write down what the quest / adventure / etc. is.
That way we stay on target (in theory anyway), but very often the players will sit around trying to determine what they think the most threatening and therefore-first-priority foe is, all the while the GM is shaking his head because they don't even have the cool big-bad on the list...
Your post nearly made me laugh. That's exactly what my players do. The funny thing is that they'll put the most random, low-key people on 'the List' just for being rude to them. At one point the question was not who in the campaign was on the list, but who wasn't.