After a few sessions of "fight for your life" dungeon crawling, last session was sort of a breather for the PCs. They escaped the dungeon via a teleport circle, and ended up in the basement ruins of a wizard's tower. They came out to find gently rolling hills and light forest, and shortly thereafter discovered a small logging village. They met up with a half elf bard/peddlar (so they could sell/trade some of their loot) got to learn a good deal about the region they were in, and interact IC with some of the locals.
During the process, they discovered an old town well that had been boarded over. They asked around about it. Most folks didn't want to discuss it, but finally they greased an old guy's liver well enough to get him to tell them the story: that wizard whose tower they ported into, who was the same one whose room in the dungeon they had looted, had fled to the town when the evil-wizard empire got smashed by dragons (see my sig) and tried to bully the townsfolk into hiding him. Low on spells and already wounded, he was easy prey for the long suffering townsfolk, who threw him in the well.
Now, the PCs suspected that he might still be down there, and they considered tking a poke, but ultimately decided to leave it be. I have little charts with Gather Info check results, and they rolled well enough to get the above info, but not enough to find out that the wizard's "ghost" appears to "take back what's his" when someone comes into town after having looted the ruins or whatever -- though one NPC did make a big deal of asking the PCs if they ook anything from the ruins, or were planning to.
So, in the middle of the night, the dead wizard, a bodak, snuck into the rooms of the PCs who still held onto items they had taken from the wizard's chambers. It snuck up on them while they slept, and it woke them staring in their faces. Both failed their saves and their roomates did not roll well enough to wake. So, in the morning, the rest of their party found 2 dead companions, missing the wizard's items.
Am I a rat bastard DM? Is that unfun?
Oh yeah: no one got XP for the session, because I don't give it out for 'good roleplaying' and such, unless a player does something that makes everyone say "AWESOME!" in unison.
(Note: I left an easy 'out' and a way to engage the PCs in their new area's adventure possibilities, that amounts to, long story short, the local Temple of Justice -- of which 2 PCs, including one of the dead ones, are clerics -- raised them and asked them to help clean up the hive of scum and villainy that is the city they have come to.)