"Ah...it was a stupid conversation anyway."
First, from my side of the fence:
It's my first 3e game, and I'm playing a brash young Wizard/Thief. The campaign premise is that there's an "Adventurer's Guild" who hires out mercenaries to help people take care of those troublesome things like zombie plagues and such.
It's our first game, and we've just arrived in the local town because the nearby abandoned church has suddenly gotten much spookier. We walk in the Inn's front doors, and I blurt out "Hi! We're from the Bravo Adventuring Company! Did somebody order a bunch of heroes?" Much amusment was had by all.
Second, from the GM's side of the fence:
My players (a bard, 2 fighters, and a cleric) are traveling along the road on their way to the next big adventure site. The stop in a small village. The villagers recognizing them as adventurer-types asks them to help with this small problem they've been having - a Behir.
The party's average level is 4.5, and they're surprising effective, all being old time game veterans. So a Behir should be doable. The party rightly realizes that they don't have to kill the nuetral behir, just get it out of the area. Their greed kicks in when they realize it'd make a great guard animal for some rich guy. So they plan on trying to talk it into becoming a pet.
I explain that behirs are rather dumb - you can talk to it, but it isn't going to understand complex thoughts, or even much beyond satisfying its basic animal drives. The party quickly finds the behir in a little dell, and send the bard in as the diplomat.
The bard loses the behir conversationally a couple of times, and I gently remind him - the behir is stupid. But progress is being made. The bard begins his final argument - if the behir doesn't leave, the villagers will kill it, or at least have the party kill the behir. In this process, the bard, standing right next to this behir utters the fatal phrase: "They sent us to kill you."
Even as the words left his mouth, he realized how dumb that had been. 2 rounds later, the bard has acquired the "tasty" flaw and is inside the behire stomach.
Even now, almost 10 levels later, all I have to do is but a "Behir" minature down (which I use for any large snake-like monster) and the party, sight unseen, leaves it alone. They'll fight demons, devils, dragons, and even evil archmages, but a behir they leave alone.