Here's one nobody usually thinks of.....
Now, in some worlds, Good holds the upper hand (Like FR, let's be real, good does still hold the upper hand) and believes it always will.
Think of the Jedi Council from Star Wars
Now, let's keep using FR as an example.
The PC's start rumbling with orcs, but unlike most orcs, these guys are trained in modern gear and tactics. Backed up by goblin archers and kobold sorcerer's.
When everyone hears about it from the PC's, they are laughed at.
More and more creepy, wierdo, militant and well-organized thingies and boojums are fought by the party.
Wehn they get back to town, they still here: "Sure, sure buddy. Squad of platemail wearing, halbred wielding orcs, flanked by goblin calvary on worgs, and supported by blue goblins and kobold sorcerers? They are the ones that took over that keep? Yah, right, that keeps always been a little too close to Zhentil keep, more than likely the Banites snapped it up."
More powerful things, still working with deadly tactics....
"Undead special forces backed by wraith strike teams and banedead artillery? Sure, sure, the drow are the ones attacking elvish forces."
Now, let's really get them in a jam. They finally meet up with the Man-Behind-The-Scenes TM and it is none other than King Azoun himself, returned from the grave as a Death Knight, and furious about what "Those puling weaklings have done to my country!"
Now, not only does everyone ridicule them, but some people are willing to lynch them for bad-mouthing King Azoun (Gods rest his weary soul) and talking bad about the Royal Family.
Great, so the good guys think they are liars, evil groups are seeing if they want to join, and everyone is laughing at them while they are desperately dodging Undead Fire Knives that His Fearsomess, King Azoun is sending after them.
They only have one foe, but once they kill him, they may be in more trouble than they would believe.
"They stole desecrated King Azoun's body! HANG THEM!"