Yeah. I thought of this idea where the party enters a growing agricultural town; there are fields of rice everywhere and herds of water buffalo, all on vast grasslands that in large patches become swampland. The party, after being received warmly by the townsfolk, warn the town of an approaching army (as I had planned). The townsfolk tell the party that there is a problem with that, namely that there is a black dragon that periodically steals their livestock and if they wanted to take their herds, the dragon might follow. Since the townsfolk have to get everything ready to go anyway, why doesn't the party go maybe take care of the problem?
Scenario A: The party encounters a lizardfolk village in the marsh. After noticing that their shaman wears a wooden mask carved to resemble the head of a black dragon, they ask if the tribe knows where the black dragon can be found. The tribe claim that they revere the dragon but if one of the party should best their greatest warrior in combat, then it is the dragon's will that the party should proceed into the dragon's lair. The party's champion bests the lizardfolk's and the party enters the dragon's lair, where they find that the dragon is the mother of a brood and has lived here far longer than the humans have, and that the herds they claim as theirs used to roam free and provide food for her and her family. The dragon, not wanting to risk the lives of her young and bringing retribution upon herself, has not attacked the town. After learning this, the party comes to some form of compromise between the dragon and the townspeople.
Scenario B: The party encounters and slaughters the lizardfolk tribe, stumbles around the swamp for a while, and finally finds the entrance to the lair. Without giving the dragon a chance to say a word, they dive in and start wailing on her with everything they have. After she is dead, they take her lone egg so that they can one day raise a dragon of their own.
I'll let you figure out which scenario happened.