
Question is, have you, as a DM, ever accidently ruined your plot hook for the PCs that you had planned?
For instance, last game I ran I had 2 hooks in place that the PCs could do in any order they saw fit. 1) Go help dwarven miner/merchant who's miners keep disappearing in his mines by unknown creature (a la Tremors, I know pathetic, but when you got notta to work with...). 2) Go to town that has rumored a powerful weapon hidden somewhere in the area (PCs had a map and everything). Well I also decided to get one of the PCs more involved in the group because as it was, he was mearly hiring the group to find the weapon. So I introduced his twin brother, who was crazy and powerful (lame I know). Anywho (lets not criticize the DM for bad plots :\ ), the twin (played by me) wound up destroying 3/4 the partys stuff and manages to piss off everyone in the group. Before the party kills him, he says he'll get their stuff back if they take him to this dangerous area thats far away.

I think my problem is I don't think of the plot when I'm in character of a NPC

So any of you done anything like that?