Make sure you use some growth items, for maximum obnoxiousness. Nothing is more annoying than retiring to your larder for a nice bite of Roquefort and finding a drunken halfling intruder in there...with a lot of empty boxes, crates and bottles.
i found another annoyance. You are doing a quest. you do every step carefully. you go to do the turn-in and the npc won't accept it. so you frantically review the quest and find that although you did every step, you weren't flagged for one because you did it out of sequence. arrrgggg - teeth-grinding irritation.